WO2018068616A1

WO2018068616A1 - Activated-carbon activation furnace and activated-carbon production method

Info

Publication number: WO2018068616A1
Application number: PCT/CN2017/102562
Authority: WO
Inventors: 张西进
Original assignee: 张西进
Priority date: 2016-10-14
Filing date: 2017-09-21
Publication date: 2018-04-19
Also published as: CN106430191A; CN106430191B; PH12019500765A1

Abstract

An activated-carbon activation furnace and an activated-carbon production method, which relate to the field of activated-carbon production devices and activated-carbon production technologies. The safety of an activated-carbon production process can be improved to a certain extent, the activation furnace can stably work for a long time, and the quality and the productive capacity of produced activated carbon can be greatly improved. The activated-carbon activation furnace comprises a furnace body, a material entry device (13), and a material discharge mechanism (15). A burning passage (6) communicating with the inside of the furnace body is disposed in the furnace body. Air is introduced in the burning passage (6). The inside of the furnace body is in a negative-pressure state, and the air pressure in the burning passage (6) is lower than that in the furnace body. The activated-carbon production method comprises the following steps: step A, arranging a burning passage (6) and material passages (5); step B, introducing steam into the material passages (5); step C, introducing evolved gas in the material passages (5), into the burning passage (6); step D, heating materials in the material passages (5); and step E, introducing flue gas generated in burning into a steam generator (10) for heat exchange. The activated-carbon activation furnace and the activated-carbon production method are mainly used for activated carbon production.

Description

Activated carbon activation furnace and activated carbon production method

Technical field

The invention relates to the field of activated carbon production equipment and activated carbon production process, and more particularly to an activated carbon activation furnace and a method for producing activated carbon.

Background technique

At present, domestic and foreign activated carbon production methods are mainly divided into two categories, namely: physical methods and chemical methods. The physical method is to first prepare the activated carbon by placing the raw materials (high-quality coal, nut shell, charcoal, etc.) in a closed furnace body, smoldering and carbonizing, and then introducing an appropriate amount of steam to activate. In the chemical method, the raw material (generally sawdust) is first impregnated with a chemical agent (phosphoric acid, zinc chloride, etc.), and then carbonized and activated in a furnace body through which air flows, thereby producing activated carbon. At present, more manufacturers use physical methods to produce activated carbon.

At present, the production of activated carbon equipment by physical methods in China is generally a traditional vertical activation furnace, an external heat type converter, a liner rotary furnace, an internal heat positive pressure rotary furnace, and an internal heat direct combustion type activation furnace. Specifically, for example, Patent Publication No.: CN 104477905 A, publication date: April 1, 2015, the name of the invention is: a heating furnace for an activated carbon production facility, the application relates to a heating furnace for an activated carbon production facility, including a heating furnace body, a heating furnace The body comprises a casing, a furnace body axially disposed inside the casing, and an insulation layer disposed between the casing and the outer furnace body, the furnace body comprising an outer furnace body and an inner furnace body, and between the outer furnace body and the inner furnace body The utility model comprises a closed cavity, wherein the cavity is provided with a plurality of heating components, one end of the inner furnace body is a feeding port, and the other end is a discharging port, and the heating furnace body is provided with a exhaust pipe connecting the inner furnace body. The setting of the heat insulation layer effectively reduces the heat loss of the heating furnace; the heating material is used to heat the raw material of the activated carbon in the inner furnace body, thereby avoiding problems such as excessive weight of the internal heat type heating furnace and excessive power consumption; and the heating assembly adopts several groups. Several heating components can achieve different temperature control of the heating temperature of the raw materials in the inner furnace body according to actual processing requirements.

However, there are certain technical defects in the existing activated furnaces for the production of activated carbon by physical methods: (1) Safety hazards are large: Since the composition of the carbonized materials is inconsistent, the change in the amount of gas will cause instability of the gas pressure, and the pressure of the gas will suddenly The rise will cause high-temperature gas deflagration, causing safety hazards such as burning of the furnace seal. Especially for the rotary activation furnace, the sealing performance at the rotary joint is relatively poor. Once the combustion phenomenon occurs, it is easy to cause a safety accident. (2) The production capacity and quality of activated carbon are low: because the furnace body can not be sealed well, the combustible gas which is heated by the material is easy to be directly burned in the area where the material is placed, resulting in a large increase in the amount of carbonized material or activated carbon ablation. The production capacity and quality of activated carbon increase the consumption of raw materials and energy consumption. At the same time, the existing activation furnace has a limited amount of feed per unit time, and the activated carbon production capacity cannot be further significantly improved, and the added raw materials are always accumulated in the lower part of the activation furnace due to gravity. It is difficult to fully contact with steam, resulting in poor activation and reducing the quality of activated carbon.

In summary, how to further improve the safety of activated carbon production process, improve its productivity and quality, is the existing technology The technical problems that need to be solved.

Summary of the invention

1. The technical problem to be solved by the invention

The invention provides an activated carbon activation furnace and a method for producing activated carbon. The activated carbon activation furnace and the activated carbon production method of the invention can improve the safety of the activated carbon production process to a certain extent and improve the quality of the activated carbon produced.

2. Technical solutions

In order to achieve the above object, the technical solution provided by the present invention is:

The activated carbon activation furnace of the present invention comprises a furnace body, a material inlet device and a discharge mechanism, wherein the material inlet device is in communication with a feed port of the furnace body, and the discharge mechanism and the discharge of the furnace body The mouth is connected, and the furnace body is provided with a combustion passage communicating with the inside of the furnace body. The combustion passage is filled with air, the inside of the furnace body is in a negative pressure state and the air pressure in the combustion passage is lower than the inside of the furnace body.

As a further improvement of the activated carbon activation furnace of the present invention, the combustion passage is arranged along the length direction of the furnace body, the first end of the combustion passage is close to the feed inlet of the furnace body and communicates with the heat exchange mechanism through the pipeline, and the tail of the combustion passage The end is close to the discharge opening of the furnace body and its opening is provided.

As a further improvement of the activated carbon activation furnace of the present invention, the furnace body is internally separated by at least two material passages, the material passages are arranged along the length direction of the furnace body, and steam is passed through each material passage.

As a further improvement of the activated carbon activation furnace of the present invention, the furnace body comprises an outer cylinder body, and at least two sections of the sub-pillar support members are circumferentially arranged along the inner wall of the outer cylinder and enclose a combustion passage, and the adjacent two sections of the sub-tank support members A material passage is formed between the inner wall of the outer cylinder and the outer wall of the combustion passage.

As a further improvement of the activated carbon activation furnace of the present invention, each of the sub-storage support members includes a sub-storage support column and a sub-storage support plate, one end of the sub-storage support column is connected with the inner wall of the outer cylinder, and the sub-pillar support column is further One end is connected with the sub-storage support plate, the sub-storage support plate is a curved plate, and the sub-storage support plate disposed along the circumferential direction encloses a circular combustion passage with a radial cross-section at a central position inside the furnace body. A section of the material passage is defined between two adjacent sub-station support columns, the inner wall of the outer cylinder and the outer wall of the combustion passage in the circumferential direction of the furnace body; a plurality of sub-tank support members are arranged along the length direction of the furnace body to form a sub-storage support Pieces.

As a further improvement of the activated carbon activation furnace of the present invention, a sub-female buckle is connected between two sub-station support members adjacent to each other in the circumferential direction of the furnace body and two sub-tank support members adjacent to each other along the longitudinal direction of the furnace body. Together, the joint gap between them is sealed with glue.

As a further improvement of the activated carbon activation furnace of the present invention, the end of the combustion passage is connected with a retaining ring, and the inner wall of the retaining ring is fixed to the outer wall of the combustion passage.

As a further improvement of the activated carbon activation furnace of the present invention, the first end of the combustion passage is sequentially connected to a steam generator, a dust remover and a chimney through a pipe, and the smoke inlet end or the smoke outlet end of the steam generator is provided with In the induced draft fan, the steam outlet of the steam generator is connected to the steam distribution mechanism through a pipeline, the steam distribution mechanism includes a plurality of steam nozzles, and at least one steam nozzle is connected in each material passage; The mechanism includes a plurality of air tubes, the plurality of air tubes are distributed along the length of the combustion passage, and each of the air tubes is correspondingly communicated with the interior of the combustion passage through a branch support.

As a further improvement of the activated carbon activation furnace of the present invention, the material feeding device supplies material through a feeding mechanism, and the discharging mechanism adopts a screw conveyor, and the outer cylinder is driven to rotate by a transmission device thereon. The first end of the combustion passage is provided with a rotary joint, and two sides of the bottom of the outer cylinder are respectively provided with a support, and the outer cylinder adjusts the relative heights of the two supports through the support adjusting device;

The inner wall of the outer cylinder is provided with an insulation layer and a refractory layer from the inside to the outside, and the refractory layer is made of a refractory castable; the branch support is made of a composite material of silicon nitride and silicon carbide;

Each steam nozzle has a steam flow valve, and each air tube is provided with an air flow valve, and the furnace body is provided with a temperature measuring device at different positions along the length direction, the steam flow valve, the air flow Both the valve and the temperature measuring device are connected to a computer.

The activated carbon production method of the invention preheats the rotary activation furnace before the start of the production of the activated carbon, and the activated carbon production comprises the following steps:

Step A: providing a combustion passage and at least two material passages in the activation furnace, the at least two material passages are disposed around the combustion passage, and the combustion passage and the material passage are connected to the inside of the activation furnace;

Step B: respectively, the materials are sent into the material passages through the material inlet device, and steam is respectively introduced into the respective material passages, and the materials are discharged after being activated by the discharging mechanism;

Step C: opening the induced draft fan in communication with the combustion passage, so that the inside of the activation furnace is in a negative pressure state and the air pressure in the combustion passage is lower than that in the activation furnace, so that the evolved gas in each material passage is introduced into the combustion passage after being heated, and is combusted. The air passing through the passage is mixed and burned;

Step D: heat generated by combustion in the combustion passage, heat radiation, heat conduction to materials in each material passage;

Step E: passing the flue gas generated by the combustion in the combustion passage into the steam generator, and after the heat exchange, the generated steam is subsequently used, and the remaining flue gas is discharged after being dusted;

With this reciprocation, step B, step C, step D, and step E are repeated until the production of activated carbon is completed.

3. Beneficial effects

Compared with the prior art, the technical solution provided by the invention has the following significant beneficial effects:

(1) In the present invention, the furnace body is provided with a combustion passage communicating with the inside of the furnace body, and the gas pressure in the combustion passage is lower than the furnace The inside of the body, so that the combustible gas which is thermally precipitated inside the furnace body is directly sucked from the inside of the furnace body into the combustion passage, and is mixed and burned with the air passing through the combustion passage, and on the other hand, the physical production of activated carbon in the furnace body is provided. On the other hand, since the gas pressure in the combustion passage is lower than the inside of the furnace body, the gas source from which the material is heated is continuously sucked into the combustion passage or burned or discharged, and the gas flows in one direction from the inside of the furnace body to the combustion passage. Therefore, the air passing through the combustion passage cannot reach the inside of the furnace body, so the area where the material inside the furnace body is placed is in an oxygen-deficient state, and the combustible gas which is thermally precipitated from the material cannot be directly burned in the area where the material inside the furnace body is placed, thereby avoiding the carbonized material. Or the activated carbon is ablated, which improves the productivity and quality of the activated carbon, reduces the consumption of raw materials and energy consumption; and since the gas pressure in the combustion passage is lower than the inside of the furnace body, there is no need to worry that the flue gas in the combustion passage breaks into the interior of the furnace body. Contaminant material.

(2) In the present invention, since the inside of the furnace body is set to a negative pressure state, even if a high-temperature gas detonation phenomenon occurs due to a sudden rise in the gas pressure inside the furnace body, the detonation flame is difficult to escape from the furnace due to the buffering action of the negative pressure state inside the furnace body. The body seal is sprayed and burned, which greatly avoids the safety accident caused by the burning of the furnace body seal.

(3) In the present invention, the inside of the furnace body is divided into at least two material passages, and since the material passages are divided into a plurality of materials, the materials fed from the feed inlet of the furnace body are evenly distributed in the respective material passages, each The thickness of the material layer in the material channel is moderate and reasonable, and the activation furnace adopts low-incline rotation. Each material channel is repeatedly rotated up and down, the number of times of material turning in the furnace is increased, the material is turned more fully, and the frequency and time of steam contact with the material. The increase is greatly improved, the optimal activation effect is achieved, and the quality of the activated carbon is improved. At the same time, after the material passage is divided into a plurality of materials, the amount of the feed per unit time is greatly increased compared with the past, and the amount of the activated carbon is significantly increased. The capacity of activated carbon.

(4) In the present invention, at least two sections of the sub-storage support members are circumferentially disposed along the inner wall of the outer cylinder and enclose a combustion passage, and are supported by the sub-pillar support members to form a combustion passage, and the adjacent two-stage sub-chamber support members and the outer cylinder body The wall and the outer wall of the combustion passage enclose a material passage, and the combustion passage and the material passage surrounded by the above structure are adopted, wherein the combustion passage is supported between the plurality of material passages, and the structural stability is good.

(5) In the present invention, each of the sub-storage support members is arranged and composed of a plurality of sub-storage support members along the length direction of the furnace body. With this modular structure, there is better deformation buffer between adjacent modules. It can prevent the material passage and the combustion passage of the assembly from being broken due to deformation, greatly improve the structural stability and reliability of the material passage and the combustion passage, and greatly improve the reliability and service life of the equipment.

(6) In the present invention, between the two sub-chamber support members adjacent to each other in the circumferential direction of the furnace body and the two sub-tank support members adjacent to each other along the longitudinal direction of the furnace body are connected by a female snap and between The joint gaps are sealed by glue, and the two adjacent silo support members can be fixedly fixed together by the female snap fastener, and even when a relatively severe thermal expansion and contraction occurs, the female snap fastener can form a certain buffer. To prevent the two adjacent sub-storage supports from falling off or breaking due to stress deformation; in order to ensure the relative sealing of the material passage and the combustion passage, the joint gap between the adjacent two sub-tank supports is sealed with glue, clay When the activation furnace is used for the first time, it is thermally solidified to provide a good sealing effect.

(7) In the present invention, each steam nozzle has a steam flow valve, and each air tube is provided with an air flow valve, and the furnace body is provided with a temperature measuring device at different positions along the length direction, and the steam flow valve The air flow valve and the temperature measuring device are all connected with the computer, and the computer intelligent control system is used. According to the different types of materials produced by the activated carbon, the temperature data of each section of the furnace body, the quantity of the incoming materials, the steam flow rate, the air flow rate, and the outer cylinder are adopted. The measurement and control of the body speed and other data realizes the intelligent control management of the whole process of production.

(8) In the present invention, the combustion passage is placed at the center of the furnace body, and the material passage is evenly distributed around the combustion passage, which is favorable for uniform radiation heating of each material passage, stabilizes the heating temperature of the material, and improves the activation effect of the material; The high-temperature flue gas after combustion in the channel passes through the steam generated by the steam generator to meet the steam demand in the production process. The entire production process does not require an external heat source, which greatly reduces the energy consumption. At the same time, the material evolved gas and then passed through the combustion. After heat exchange, dust removal and purification, it solves the pollution problem caused by the evolved gas and meets the green environmental protection standard.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly described below. It should be understood that the following drawings show only certain embodiments of the present invention, and therefore It should be seen as a limitation on the scope, and those skilled in the art can obtain other related drawings according to these drawings without any creative work.

1 is a schematic structural view of an activated carbon activation furnace of Embodiment 1;

Figure 2 is a cross-sectional view showing the structure of the furnace body of Figure 1 in the radial direction;

3 is a schematic structural view of a single sub-station support member in Embodiment 2;

4 is a schematic right side view of the outer cylinder body in the third embodiment;

Fig. 5 is a flow chart showing a method for producing activated carbon of Example 4.

The label description in the schematic diagram:

1, outer cylinder; 2, insulation layer; 3, refractory layer; 4, sub-storage support; 401, sub-storage support column; 402, sub-storage support plate; 5, material passage; 6, combustion passage; Distribution mechanism; 8, air distribution mechanism; 9, induced draft fan; 10, steam generator; 11, dust collector; 12, chimney; 13, material into the furnace; 14, loading mechanism; 15, discharge mechanism; 16. Transmission device; 17, support adjustment device; 18, rotary joint; 19, retaining ring.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. Accordingly, the following details of embodiments of the invention provided in the accompanying drawings The description is not intended to limit the scope of the invention as claimed, but merely to represent selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

In order to further understand the present invention, the present invention will be described in detail with reference to the accompanying drawings.

Example 1

Referring to FIG. 1 and FIG. 2, the activated carbon activation furnace of the embodiment includes a furnace body, a material inlet device 13 and a discharge mechanism 15, and the material inlet device 13 communicates with the feed port of the furnace body, and the discharge mechanism 15 and the furnace The discharge port of the body is connected, and the combustion chamber 6 is provided with a combustion passage 6 communicating with the inside of the furnace body. The combustion passage 6 is filled with air, the inside of the furnace body is in a negative pressure state and the air pressure in the combustion passage 6 is lower than the inside of the furnace body.

At present, the level and method of the process cannot completely seal the area between the furnace bodies. Therefore, the combustible gas which is thermally precipitated by the material is likely to be directly burned in the area where the material is placed, thereby causing a large increase in the amount of carbonized material or activated carbon ablation, and reducing the activated carbon. The production capacity and quality increase the consumption of raw materials and energy consumption, but in the present embodiment, the above problems are completely avoided, as follows:

In this embodiment, the furnace body is provided with a combustion passage 6 communicating with the interior of the furnace body (the four walls of the combustion passage 6 divide the combustion passage 6 and the area where the material inside the furnace body are placed into two relatively independent regions), and the combustion passage The gas pressure in the gas is lower than the inside of the furnace body, so that the combustible gas which is thermally precipitated inside the furnace body is directly sucked from the inside of the furnace body into the combustion passage 6, and is mixed with the air passing through the combustion passage 6, and burned. The utility model provides a heat source for the production of activated carbon by the physical method inside the furnace body, specifically, heat radiation and heat transfer generated by combustion in the combustion passage 6 to the material; on the other hand, since the gas pressure in the combustion passage 6 is lower than the inside of the furnace body, the material is thermally precipitated. The gas is continuously sucked into the combustion passage 6 or burned or discharged. The gas flows unidirectionally from the inside of the furnace body to the combustion passage 6, so that the air passing through the combustion passage 6 cannot reach the inside of the furnace body, so the inside of the furnace body The area where the material is placed is in anoxic state, and the combustible gas which is thermally precipitated from the material cannot be directly burned in the area where the material inside the furnace body is placed, avoiding carbonized material or active The charcoal is ablated, which improves the productivity and quality of the activated carbon, reduces the consumption of raw materials and energy consumption; and since the gas pressure in the combustion passage 6 is lower than the inside of the furnace body, there is no need to worry that the flue gas in the combustion passage 6 breaks into the interior of the furnace body. And the pollutants.

Since the composition of the carbonized material is inconsistent and heated, the change in the amount of gas generated may cause instability of the gas pressure (that is, the carbonization material may be heated unevenly, etc., causing a change in the gas production in the furnace, thereby causing instability of the gas pressure), and the sudden rise of the gas pressure may cause The high-temperature gas deflagration causes safety hazards such as the burning of the furnace body seal. Especially for the rotary type heating furnace, the sealing performance at the rotary joint is relatively poor. Once the burning phenomenon occurs, it is easy to cause a safety accident, but in this embodiment, The above problem is completely avoided, as follows: In the present embodiment, the inside of the furnace body is set to a negative pressure state, so even if a high temperature gas detonation phenomenon occurs due to a sudden rise in pressure inside the furnace body, the buffer of the internal negative pressure state of the furnace body is buffered. The flame of the detonation is difficult to be ejected from the seal of the furnace body, which greatly avoids the safety accident caused by the burning of the seal of the furnace body.

Preferably, in this embodiment, the combustion passage 6 is disposed along the longitudinal direction of the furnace body, the first end of the combustion passage 6 is close to the feed inlet of the furnace body and communicates with the heat exchange mechanism through the pipeline, and the tail end of the combustion passage 6 is close to the furnace body. The discharge port and its opening are set.

In this embodiment, the combustion passage 6 is disposed along the longitudinal direction of the furnace body, so that the combustion passage 6 heats the material inside the furnace body along the length direction of the furnace body, thereby improving the heating effect of the material; the first end of the combustion passage 6 passes through the pipeline and The heat exchange mechanism is connected to heat recovery of the high-temperature flue gas after combustion in the combustion passage 6, thereby improving energy utilization efficiency; the first end of the combustion passage 6 extends to the feed port of the furnace body, and the tail end of the combustion passage 6 extends to the furnace The discharge opening of the body, and the opening end of the combustion passage 6 is arranged, so that the combustible gas which is thermally precipitated inside the furnace body is collected in the direction in which the material moves, and then passes into the tail end of the combustion passage 6, which is beneficial to the flammable gas more smoothly. It is burned into the combustion passage 6.

It should be noted that, in this embodiment, the orientation of the first end and the trailing end of the combustion passage 6 can be reversed, and the collection of the combustible gas in the combustion passage 6 can also be achieved; and the head end of the combustion passage 6 can also be The tail ends are respectively connected to the heat exchange mechanism through the pipeline, and cut or dig holes at a certain portion in the middle of the combustion passage 6 to form an opening for extracting the combustible gas, and the collection of the combustible gas in the combustion passage 6 can also be realized. The purpose of the above technical solution is that the combustion passage 6 communicates with the inside of the furnace body, and the flue gas after combustion inside the combustion passage 6 passes through the heat exchange mechanism to recover heat, if the person skilled in the art is inspired by it, In the case of the inventive concept herein, the structural form and the embodiment similar to the technical solution are not creatively designed, and are all within the scope of protection of the present invention.

Preferably, in the embodiment, the furnace body is separated by at least two material passages 5, and the material passages 5 are arranged along the length direction of the furnace body, and steam is passed through each of the material passages 5.

The existing activation furnace has a limited amount of feed per unit time, so the activated carbon production capacity cannot be further significantly improved, and the added raw materials are always accumulated in the lower part of the activation furnace due to gravity, and it is difficult to fully contact with the steam, resulting in poor activation effect and reduced activated carbon. quality.

In this embodiment, the inside of the furnace body is divided into at least two material passages 5, and the material passages 5 are arranged along the length direction of the furnace body, and the materials fed from the feed inlet of the furnace body are evenly distributed in the respective material passages 5. The production capacity and quality of activated carbon can be significantly improved. The specific reasons are as follows: There is only one large material passage in the existing activation furnace, and the materials are added according to the specified amount. Although the activation furnace can rotate, a large amount of materials always accumulate due to gravity. In the lower part of the activation furnace, a thicker material layer is formed in the lower part of the activation furnace. On the one hand, it is difficult to fully flip over to fully contact with steam, the activation effect is poor, and the quality of the activated carbon is lowered; on the other hand, all materials are under gravity It is deposited in the lower part of the activation furnace and has a certain thickness. The inside of the thick material layer is difficult to fully contact with the steam, and the material activation effect inside the material layer is obviously poor, resulting in the quality of the activated carbon being uneven. In the present embodiment, the above problem can be improved to some extent, as follows: the interior of the furnace body is divided into at least two material passages 5, and the material passages 5 are divided into a plurality of materials, which are fed from the feed inlet of the furnace body. The materials are evenly distributed in each material passage 5, and the thickness of the material layer in each material passage 5 is moderate and reasonable, and the activation furnace is rotated at a low inclination, and each material passage 5 is repeatedly rotated up and down, and the number of times the material is turned in the furnace Increase, material turnover The movement is more sufficient, the number and time of contact between the steam and the material is greatly increased, the optimal activation effect is achieved, and the quality of the activated carbon is improved. At the same time, after the material channel 5 is divided into a plurality of parts, under the premise of ensuring the quality of the activated carbon, the feeding amount per unit time is greatly increased compared with the past (because the material channel 5 is divided into a plurality of parts, under the same total feeding amount condition, The mixing of materials and steam is significantly improved, providing conditions for increasing the total amount of feed per unit time; although the feed amount of single material passage 5 is relatively small, the total amount of feed for all material passages 5 is relatively significantly increased), in theory The more the material channel 5 is separated, the better, but considering the actual conditions of the manufacturing and production process, the inside of the furnace body is divided into 3 to 12 material passages in this embodiment. In this embodiment, the interior of the furnace body is divided into The 8 material channels 5 have a total amount of feed per unit time of 2 to 3 times, which significantly increases the capacity of activated carbon.

Preferably, the furnace body in the embodiment comprises an outer cylinder 1 which is rolled from a steel plate. The inner wall of the outer cylinder 1 is provided with an insulation layer 2 and a refractory layer 3 from the inside to the outside, and the conventional activation furnace Generally, refractory bricks are used as the refractory layer 3, and the refractory bricks will expand under high temperature conditions, and vibration will occur during the rotation of the activation furnace, which easily causes loosening of the refractory bricks and deformation of the furnace body. In the embodiment, the refractory layer 3 is made of refractory castable, so that the refractory layer 3 has excellent performances such as high temperature resistance and high strength, thereby improving the reliability and service life of the equipment.

In this embodiment, the furnace body comprises an outer cylinder body 1, and at least two sections of the sub-chamber support member 4 are circumferentially arranged along the inner wall of the outer cylinder body 1 and enclose a combustion passage 6, two adjacent sections of the sub-chamber support member 4 and the outer cylinder body. A material passage 5 is defined between the inner wall and the outer wall of the combustion passage 6. Referring to FIG. 2, in the present embodiment, the combustion passage 6 and the plurality of material passages 5 are surrounded by a plurality of sub-storage support members 4. Specifically, at least two sub-storage support members 4 are circumferentially disposed along the inner wall of the outer cylinder 1 The combustion passage 6 is supported by the sub-pillar support 4 to form a combustion passage 6, and the adjacent two-stage sub-station support 4, the inner wall of the outer cylinder 1 and the outer wall of the combustion passage 6 enclose a material passage 5, which is surrounded by the above structure. The combustion passage 6 and the material passage 5 are formed, wherein the combustion passage 6 is supported between the plurality of material passages 5, and the structural stability is good. In this embodiment, the multi-segment sub-station support member 4 constituting the combustion passage 6 and the material passage 5 can be an integrated structure, which is integrally formed and molded at one time, and is convenient to manufacture.

Preferably, the first end of the combustion passage 6 is connected to the steam generator 10, the dust remover 11 and the chimney 12 through a pipeline, and the air inlet end and or the smoke outlet end of the steam generator 10 are provided with an induced draft fan 9 (specifically, this embodiment) An inlet fan 9 is disposed on the inlet end and the outlet end of the steam generator 10, and the induced draft fan 9 disposed at the inlet end of the steam generator 10 is mainly used to make the inside of the furnace body a negative pressure state and the combustion passage 6 The air pressure is lower than the inside of the furnace body, and the induced draft fan 9 disposed at the cigarette end of the steam generator 10 is mainly used for discharging the flue gas after the heat exchange, and the steam outlet of the steam generator 10 is connected to the steam distribution mechanism 7 through the pipeline. Providing steam for the material in the material passage 5, the steam distribution mechanism 7 includes a plurality of steam nozzles, and at least one steam nozzle is introduced in each material passage 5; in this embodiment, after combustion in the combustion passage 6 The high-temperature flue gas passes through the steam generated by the steam generator 10 to meet the steam demand in the production process, and the entire production process does not require external heat energy, which greatly saves production cost and reduces energy consumption; and the high-temperature flue gas passes through the steam generation. 10 Heat, dust collector emissions purification 11, solve the problem of smoke pollution on the environment, to achieve the environmental protection standards. The air distribution mechanism 8 includes a plurality of An air tube, a plurality of air tubes are distributed along the length of the combustion passage 6, and each air tube is correspondingly communicated with the interior of the combustion passage 6 through a sub-tank support member 4, thereby solving the seal caused by the air tube passing through the rear end of the combustion passage 6. , bending deformation, maintenance difficulties and other issues. Among them, the supply of air at different positions in the combustion passage 6 can be controlled to adjust the intensity of the flame in the combustion passage 6, thereby adjusting the temperature distribution in the furnace to better meet the needs of the production process and improve product quality.

The material feeding device 13 supplies material through the feeding mechanism 14, the discharging mechanism 15 adopts a screw conveyor, and the outer cylinder 1 is driven to rotate through the transmission device 16 thereon. The first end of the combustion passage 6 is provided with a rotary joint 18, and the outer cylinder The two sides of the bottom of the body 1 are respectively provided with a support, and the relative heights of the two supports are adjusted by the support adjusting device 17. In this embodiment, the support near the inlet of the furnace body is higher than the feed away from the furnace body. The support at the mouth and the relative height of the two supports are arranged such that the outer cylinder 1 is inclined as a whole, so that the material is gradually pushed into the discharge mechanism 15 in the outer cylinder 1 with the rotation of the outer cylinder 1.

Each steam nozzle has a steam flow valve, and each air tube is provided with an air flow valve, and the furnace body is provided with temperature measuring devices, steam flow valves, air flow valves and temperature measuring at different positions along the length direction. The devices are all connected to a computer. In this embodiment, the computer intelligent control system is used to measure and control the temperature data of each section of the furnace body, the quantity of the in-furnace material, the steam flow rate, the air flow rate, and the rotational speed of the outer cylinder body 1 according to different types of materials produced by the activated carbon. The intelligent control management of the whole process of production has been realized.

Example 2

Referring to FIG. 3, the activated carbon activation furnace of the present embodiment has the same structure as that of Embodiment 1, and further:

In this embodiment, each of the sub-station support members 4 includes a sub-storage support column 401 and a sub-storage support plate 402. One end of the sub-storage support column 401 is connected to the inner wall of the outer cylinder body 1, and the other end of the sub-storage support column 401 is divided into points. The warehouse support plates 402 are connected, the sub-storage support plates 402 are curved plates, and the sub-storage support plates 402 disposed along the circumferential direction enclose a circular combustion passage 6 in a radial horizontal direction at the inner center position of the furnace body, along the circumferential direction of the furnace body A pair of adjacent sub-storage support columns 401, an inner wall of the outer cylinder 1 and an outer wall of the combustion passage 6 enclose a section of a material passage 5; a plurality of sub-tank support members 4 are arranged along the length of the furnace body and form a section. The warehouse support member 4; specifically, in the embodiment, the length of the combustion passage 6 is set to 12 to 20 meters, the inner diameter is set to 0.4 to 1.0 meters, and the height of the material passage 5 is set to 0.2 to 0.5 meters. Wherein, the combustion passage 6 is placed at the center of the furnace body, and the material passage 5 is evenly distributed around the combustion passage 6, which is favorable for uniform radiation heating of the material passages 5, stabilizes the heating temperature of the material, and improves the activation effect of the material; The high-temperature flue gas after combustion in 6 is steamed by steam generator 10 to meet the steam demand in the production process. The entire production process does not require an external heat source, which greatly reduces energy consumption. At the same time, the material evolved gas after combustion. Through heat exchange, dust removal and purification, the problem of environmental pollution caused by the evolved gas is solved, and the green environmental protection standard is reached.

Since the metal material has good sealing performance without severe deformation, the inventor initially tends to use the metal material to make the combustion passage 6 or the material passage 5, but in the actual use of the activation furnace, the inside of the furnace body is 900. High temperature around the temperature, after a period of use, almost all metal materials (such as high temperature stainless steel) Both the material channel 5 and the combustion channel 6 have problems such as bending, deformation, cracking, gas leakage, and fracture, which are difficult to meet the needs of use. How to find a high-temperature resistant metal material suitable for the internal use of the activation furnace is a key research topic in the early stage of the inventor, but the inventors did not find a suitable high temperature resistant metal material after investing a lot of manpower and material resources. Summarizing the previous failure experience, the inventors found that the existing activated carbon activation furnace is huge in volume, and the material passage 5 and the combustion passage 6 made of metal materials are subjected to the inside of the activation furnace due to the relatively large axial and radial dimensions. After the strong thermal expansion and contraction effect, the deformation, cracking and even fracture of the metal material itself cannot be avoided at the current material science level, and the axial and radial dimensional accuracy of the rotary joint in the activation furnace is more strict. Material passages 5 and combustion passages 6 made of metal materials are difficult to achieve based on current state of the art.

The inventor discovered through experiments that the sub-storage support member 4 is made of a composite material of silicon nitride and silicon carbide, and has the properties of high temperature resistance, high strength, good toughness, good oxidation resistance and thermal conductivity, and greatly improves the reliability of the device. Service life. In this embodiment, each of the sub-storage support members 4 is arranged and arranged along the length direction of the furnace body by a plurality of sub-storage support members 4, and adopts such a modular (fragmented) structure form, and there are adjacent modules. The better deformation buffer can prevent the assembled material passage 5 and the combustion passage 6 from being broken due to deformation, greatly improving the structural stability and reliability of the material passage 5 and the combustion passage 6, and greatly improving the reliability of the equipment. Sex and age.

Preferably, in order to ensure that the assembled material passage 5 and the combustion passage 6 have both high structural strength and good sealing performance, in this embodiment, between the two sub-station support members 4 adjacent to the circumferential direction of the furnace body The two sub-tank support members 4 adjacent to the length of the furnace body are connected by a female snap ring and the joint gap between them is sealed by a glue, and the adjacent two bins can be separated by the sub-female buckle. The support members 4 are relatively fixed together, and even when a relatively severe thermal expansion and contraction occurs, the female snap fasteners can form a certain buffer to prevent the two adjacent split support members 4 from falling off due to stress deformation or In order to ensure the relative sealing of the material passage 5 and the combustion passage 6, the connection gap between the adjacent two sub-station supports 4 is sealed by a glue, and the cement is thermally solidified when the activation furnace is used for the first time, which is a good seal. effect. It should be emphasized that although the structure and assembly method of the above-mentioned sub-female connection and the glue seal seem to be simple, it has been confirmed by the inventors on several occasions that the two cooperate with each other to improve the structural stability of the material passage 5 and the combustion passage 6. And ensure the corresponding sealing of the material passage 5 and the combustion passage 6.

It should be noted that the activated carbon activation furnace of the present embodiment is used for the physical production of activated carbon. Therefore, in the process of heat activation of the material in the material passage 5, it is necessary to ensure that the material passage 5 has a good regional sealing performance to avoid materials. The heated precipitation gas directly in the material passage 5 generates a combustion reaction to ablate the carbonized material or the activated carbon, thereby affecting the productivity and quality of the activated carbon. The material passage 5 prepared by using the sub-station support member 4 has good sealing performance, but the distance It is better to meet the requirements of the physical method for producing the activated carbon for the sealing performance of the material passage 5, and there is still room for further improvement. At this time, it should be emphasized that the material passage 5 made by using the plurality of sub-pillar support members 4 in this embodiment must be In combination with the structure in the present embodiment that the inside of the furnace body is in a negative pressure state and the gas pressure in the combustion passage 6 is lower than the inside of the furnace body, because the two cooperate When used, the combustible gas which is heated by the material can be sucked into the combustion passage 6 from the inside of the furnace body, and the air is mixed in the combustion passage 6 to be burned to ensure that the material passage 5 is in an oxygen-deficient state. At the same time, the air and the flue gas in the combustion passage 6 cannot be mixed into the material passage 5, thereby directly satisfying the extremely high requirement of the physical method for producing the activated carbon for the sealing performance of the material passage 5, thereby ensuring the structural stability of the material passage 5 and the combustion passage 6. Sex, improve equipment life, reduce costs, and ensure the production capacity and quality of activated carbon.

Example 3

Referring to FIG. 4, the activated carbon activation furnace of the present embodiment has the same structure as that of Embodiment 2, and further:

In the present embodiment, the end of the combustion passage 6 is connected to a retaining ring 19, and the inner wall of the retaining ring 19 is fixed to the outer wall of the combustion passage 6. During the rotation of the outer cylinder 1, the material passage 5 located at the upper end of the combustion passage 6 is easy to be used for the gas in the material passage 5 when it is sucked into the combustion passage 6 due to the accumulation of the material at the bottom thereof. It is brought into the combustion passage 6, and by the installation of the retaining ring 19, the material accumulated in the material passage 5 which is rotated to the upper end of the combustion passage 6 can be blocked from being directly dropped into the combustion passage 6.

Example 4

Referring to FIG. 5, in the activated carbon production method of the present embodiment, the activated carbon activation furnace in the third embodiment is preheated before the start of activated carbon production, and the activated carbon production includes the following steps:

Step A: a combustion passage 6 and at least two material passages 5 are disposed in the activation furnace, and the at least two material passages 5 are disposed around the combustion passage 6, and the combustion passage 6 and the material passage 5 are communicated with the activation furnace;

Step B: The materials are respectively sent into the material passages 5 through the material feeding device 13, and steam is respectively introduced into the respective material passages 5. After the materials are activated, the materials are discharged through the discharging mechanism 15;

Step C: opening the induced draft fan 9 communicating with the combustion passage 6 so that the inside of the activation furnace is in a negative pressure state and the air pressure in the combustion passage 6 is lower than that in the activation furnace, so that the evolved gas in each material passage 5 is introduced into the combustion passage 6 after being heated. Internally mixed with and combusted with air passing through the combustion passage 6;

Step D: heat generated by combustion in the combustion passage 6 is thermally radiated and thermally conducted to materials in the respective material passages 5;

Step E: the flue gas generated by the combustion in the combustion passage 6 is introduced into the steam generator 10, and after the heat exchange, the generated steam is subsequently used, and the remaining flue gas is discharged after being dusted;

The invention and its embodiments have been described above schematically, and the description is not limited thereto, and only one embodiment of the present invention is shown in the drawings, and the actual structure is not limited thereto. Therefore, if the person skilled in the art is inspired by the invention, the structural manners and embodiments similar to the technical solution are not creatively designed, and should belong to the protection scope of the present invention. .

Claims

An activated carbon activation furnace comprises a furnace body, a material inlet device (13) and a discharge mechanism (15), and the material inlet device (13) is in communication with a feed port of the furnace body, the discharge mechanism (15) communicating with the discharge port of the furnace body, wherein the furnace body is provided with a combustion passage (6) communicating with the interior of the furnace body, and the combustion passage (6) is filled with air, and the inside of the furnace body It is in a negative pressure state and the air pressure in the combustion passage (6) is lower than the inside of the furnace body.
The activated carbon activation furnace according to claim 1, wherein the combustion passage (6) is disposed along the length of the furnace body, and the first end of the combustion passage (6) is close to the inlet of the furnace body and passes through the pipeline The heat exchange mechanism is connected, and the tail end of the combustion passage (6) is close to the discharge port of the furnace body and its opening is arranged.
The activated carbon activation furnace according to claim 2, characterized in that the inside of the furnace body is separated by at least two material passages (5), and the material passages (5) are arranged along the length direction of the furnace body, and each material passage (5) There is steam inside.
The activated carbon activation furnace according to claim 3, characterized in that the furnace body comprises an outer cylinder (1), and at least two sections of the sub-station support (4) are arranged circumferentially along the inner wall of the outer cylinder (1) A combustion passage (6) encloses a material passage (5) between the adjacent two-stage silo support (4), the outer wall of the outer cylinder (1) and the outer wall of the combustion passage (6).
The activated carbon activation furnace according to claim 4, wherein each of the sub-tank support members (4) comprises a sub-station support column (401) and a sub-storage support plate (402), and the sub-storage support column (401) One end is connected to the inner wall of the outer cylinder (1), and the other end of the sub-station support column (401) is connected to the sub-chamber support plate (402), which is a curved plate, along the circumference To the set sub-storage support plate (402), a circular combustion passage (6) is formed in a radial horizontal direction at the center position of the furnace body, and two sub-pillar support columns (401) and an outer cylinder adjacent to each other along the circumferential direction of the furnace body A section of the material passage (5) is enclosed between the inner wall of the body (1) and the outer wall of the combustion passage (6); a plurality of sub-tank support members (4) are arranged along the length of the furnace body to form a section of the sub-station support member ( 4).
The activated carbon activation furnace according to claim 5, characterized in that: two sub-tank support members (4) adjacent to each other along the longitudinal direction of the furnace body along two circumferentially adjacent sub-chamber support members (4) of the furnace body The female snaps are connected together and the joint gap between them is sealed with glue.
The activated carbon activation furnace according to claim 5, characterized in that the end of the combustion passage (6) is connected with a retaining ring (19), and the inner wall of the retaining ring (19) is fixed to the combustion passage (6) On the outer wall.
The activated carbon activation furnace according to claim 5, wherein the first end of the combustion passage (6) is in communication with the steam generator (10), the dust remover (11), and the chimney (12) through a pipe, An inlet fan and/or a smoke outlet end of the steam generator (10) are provided with an induced draft fan (9), and the steam outlet of the steam generator (10) is connected to the steam distribution mechanism (7) through a pipe, the steam The dispensing mechanism (7) comprises a plurality of steam nozzles, at least one steam nozzle is introduced in each material passage (5); the air distribution mechanism (8) comprises a plurality of air tubes, and the plurality of air tubes are along the combustion passage (6) is distributed in the longitudinal direction and each air tube is correspondingly communicated with the interior of the combustion passage (6) through a sub-tank support (4).
The activated carbon activation furnace according to any one of claims 5 to 8, characterized in that the material inlet device (13) The material is supplied by a loading mechanism (14) which uses a screw conveyor, the outer cylinder (1) being driven to rotate by a transmission (16) thereon, the combustion passage (6) The first end of the outer cylinder body (1) is provided with a rotary joint (18), and one side of the bottom of the outer cylinder body (1) is respectively provided with a support, and the outer cylinder body (1) adjusts the relative heights of the two supports through the support adjusting device (17). ;

The inner wall of the outer cylinder (1) is provided with an insulation layer (2) and a refractory layer (3) from the inside to the outside, and the refractory layer (3) is made of refractory castable; the branch support (4) a composite material made of silicon nitride bonded with silicon carbide;

Each steam nozzle has a steam flow valve, and each air tube is provided with an air flow valve, and the furnace body is provided with a temperature measuring device at different positions along the length direction, the steam flow valve, the air flow Both the valve and the temperature measuring device are connected to a computer.
The invention relates to a method for producing activated carbon, which is characterized in that a rotary type activation furnace is preheated before the start of activated carbon production, and the activated carbon production comprises the following steps:

Step A: providing a combustion passage and at least two material passages in the activation furnace, the at least two material passages are disposed around the combustion passage, and the combustion passage and the material passage are connected to the inside of the activation furnace;

Step B: respectively, the materials are sent into the material passages through the material inlet device, and steam is respectively introduced into the respective material passages, and the materials are discharged after being activated by the discharging mechanism;

Step C: opening the induced draft fan in communication with the combustion passage, so that the inside of the activation furnace is in a negative pressure state and the air pressure in the combustion passage is lower than that in the activation furnace, so that the evolved gas in each material passage is introduced into the combustion passage after being heated, and is combusted. The air passing through the passage is mixed and burned;

Step D: heat generated by combustion in the combustion passage, heat radiation, heat conduction to materials in each material passage;

Step E: passing the flue gas generated by the combustion in the combustion passage into the steam generator, and after the heat exchange, the generated steam is subsequently used, and the remaining flue gas is discharged after being dusted;

With this reciprocation, step B, step C, step D, and step E are repeated until the production of activated carbon is completed.