Device and method for preparing dechlorinated activated carbon

Abstract

The invention discloses a preparation device and method of dechlorinated activated carbon, and belongs to the technical field of dechlorinated activated carbon. The device has the advantages that after water is purified for a period of time, dechlorinated activated carbon is fully adsorbed, but the device still has the characteristics of sterilization and bacteriostasis, and organic pollutants adsorbed on the surface of the activated carbon are prevented from degrading under the action of microorganisms and deteriorating the quality of effluent. The dechlorinated activated carbon is prepared from high-quality coconut shells and the like as raw materials through the procedures of carbonization (smoldering furnace 750-800 DEG C), activation (activation in a Slapple activation furnace by high-temperature water vapor at 950-1000 DEG C), crushing, screening, winnowing, chlorination treatment, water washing, drying and the like, and the activated carbon used for pretreatment dechlorination is generally amorphous granular coconut shell activated carbon with the iodine value of 900 mg / g or above. The adsorbent has the advantages of high mechanical strength, developed pore structure, large specific surface area, high adsorption speed, no toxicity, no harm and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of dechlorination activated carbon, and in particular relates to a preparation device and method of dechlorination activated carbon. Background Art

[0002] Activated carbon is a high-quality adsorbent and catalyst. Its adsorption performance mainly depends on its specific surface area and porosity. Dechlorination activated carbon, as a special activated carbon, is mainly used in water purification and removal of residual chlorine in water. Chlorine is a common disinfectant used to kill bacteria and viruses in water. However, excessive chlorine can also have a negative impact on human health.

[0003] The working principle of activated carbon dechlorination agent is mainly to remove residual chlorine in water through the adsorption of activated carbon. Activated carbon is a porous carbon material with a large surface area and strong adsorption capacity, which can effectively remove chlorine from water. The advantage of this dechlorination agent is that it is a physical process and does not produce any chemical residues. However, its disadvantage is that if the concentration of residual chlorine in water is too high, the adsorption capacity of activated carbon will quickly saturate and need to be replaced frequently, so regeneration and service life are particularly important.

[0004] Activated carbon is a material with rich pores, large specific surface area and strong adsorption capacity. It is widely used in food processing, pharmaceutical, chemical, metallurgical, national defense and environmental protection industries. Different varieties of activated carbon can be prepared by using different raw materials and processes. Different varieties of activated carbon show different adsorption characteristics due to the differences in their pore characteristics and surface characteristics. Activated carbon can be divided into powdered carbon and granular carbon according to its shape. The particle size of powdered carbon can be processed according to needs; granular carbon is divided into amorphous carbon and shaped carbon. However, activated carbon also has unsolvable problems in water treatment, especially in purification equipment for deep treatment of drinking water. That is, the problem of self-contamination of activated carbon medium. It is like a super sponge. While absorbing a large number of toxic and harmful pollutants, a large number of bacteria will breed in its micropores. Experiments show that when the activated carbon filter is used for a certain period of time, the activated carbon absorbs a large amount of organic pollutants, and the residual chlorine with bactericidal effect does not exist, so microorganisms are easy to reproduce; organic matter decomposes on the interface of the activated carbon under the action of microorganisms, and the organic amines are gradually decomposed into protein ammonia, ammonia nitrogen, and nitrite nitrogen, which increases the nitrite content in the effluent of the activated carbon filter. This not only fails to achieve the purpose of purifying water quality, but also pollutes the water quality. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a preparation device and method for dechlorinated activated carbon to solve the problem that the activated carbon adsorbs a large amount of organic pollutants to saturation, and the residual chlorine with antibacterial effect does not exist, causing microorganisms to grow and multiply on its surface; the organic matter is decomposed on the interface of the activated carbon under the action of microorganisms, so that the organic amines are gradually decomposed into protein ammonia, ammonia nitrogen, and nitrite nitrogen, which increases the nitrite content in the effluent water of the activated carbon filter and further deteriorates the water quality of the purified water.

[0006] The technical solution adopted by the invention is: a dechlorinated activated carbon preparation device, a preparation box, the technical key points of which are that the outer surface of the bottom side of the preparation box is fixedly connected with a support leg, the side wall of the preparation box is connected with a feed pipe, a reaction gas inlet pipe is arranged at the bottom center axis of the preparation box, the reaction gas inlet pipe passes through the bottom of the preparation box and extends to the inner cavity of the preparation box, the outer wall of the bottom of the preparation box is connected with a discharge valve, and the top side of the preparation box is connected with an exhaust pipe; A rotating rod is arranged at the central axis of the top of the preparation box, the rotating rod passes through the top of the preparation box and extends to the inner cavity of the preparation box, and a motor driving the rotating rod to rotate is fixedly connected to one end of the rotating rod away from the preparation box; An inverted cone-shaped leakage screen is fixedly connected to the outer surface of the extended portion of the reaction gas inlet pipe, and one end of the inverted cone-shaped leakage screen away from the reaction gas inlet pipe is fixedly connected to the inner wall of the preparation box. The extended portion of the reaction gas inlet pipe is located directly below the inverted cone-shaped leakage screen and is fixedly connected to a conical guide plate on the outer surface; a plurality of gas holes are provided on the reaction gas inlet pipe and the conical guide plate.

[0007] In the above scheme, a moving ball is provided at the bottom of the rotating rod, and the moving ball is connected to the auxiliary moving rod through an arc-shaped moving rod. The arc-shaped moving rod is also connected to the arc-shaped flipping rod through an inclined rotating straight rod. Each arc-shaped flipping rod constitutes a flipping assembly for material mixing that can swing along the inner surface of the inverted cone-shaped screen; the moving ball is forced to move up and down along the inner cavity of the rotating rod, thereby driving the arc-shaped moving rod, the auxiliary moving rod and the arc-shaped flipping rod to move up and down in turn.

[0008] In the above scheme, a sliding groove is opened on the circumference of the side wall of the rotating rod, and the moving ball is connected to the top of the rotating rod through a return spring; one end of the arc-shaped moving rod connected to the moving ball passes through the sliding groove and is connected to the auxiliary moving rod, and the other end of the arc-shaped moving rod is connected to the moving ball and moves up and down along the sliding groove driven by the moving ball.

[0009] In the above scheme, the interior of the arc-shaped moving rod is hollowed out, and an auxiliary ball is slidably arranged at the inner central axis of the arc-shaped moving rod. The auxiliary ball is connected to the moving ball through an elastic strip, and the auxiliary ball is connected to the arc-shaped flipping rod through a rotating straight rod. A transverse groove is provided on the bottom side of the arc-shaped moving rod, and one end of the rotating straight rod connected to the auxiliary ball passes through the above-mentioned transverse groove and is connected to the arc-shaped flipping rod. The auxiliary ball is limited by the transverse groove, and the outer surface of the arc-shaped flipping rod is contacted with the outer surface of the inverted cone-shaped leakage net.

[0010] In the above scheme, the auxiliary ball is connected to the auxiliary moving rod through an elastic strip, the auxiliary moving rod is connected to one end of the tilting rod through an arc-shaped auxiliary rod, and the other end of the tilting rod is connected to an arc-shaped pushing plate; each arc-shaped pushing plate is respectively inclined at the top opening of the reaction gas inlet tube; each arc-shaped pushing plate constitutes a pushing component that moves the gas coming out of the reaction gas inlet tube to both sides.

[0011] In the above scheme, the bottom of the arc-shaped push plate is on the extrusion deformation ball, the extrusion deformation ball is arranged facing the top opening of the reaction gas inlet pipe, and the extrusion deformation ball is connected to the piston plate through the piston rod.

[0012] In the above solution, the piston plate is arranged inside the reaction gas inlet pipe, and the side wall of the piston plate does not contact the inner wall of the reaction gas inlet pipe.

[0013] A method for preparing dechlorinated activated carbon, using a dechlorinated activated carbon preparation device, the technical key points of which are as follows: S1: Prepare high-quality coconut shells, select and remove impurities, and grind them. During the pickling process, the ratio of coconut shell activated carbon, industrial hydrochloric acid and water is preferably maintained at 10:1:50. This step can effectively clean the impurities in the coconut shell activated carbon and improve its adsorption capacity and use effect. After drying, the pre-treated raw fruit shells are transported to the batching warehouse for storage, and then transported to the molding area; S2: Molding process, the raw fruit shells after pretreatment in the batching bin are fed with appropriate amounts of auxiliary materials (such as adhesives and curing agents, sodium bicarbonate and acrylic acid mixtures) through a quantitative feeder. The mixture ratio refers to the pretreated raw coconut shell: adhesive: curing agent: sodium bicarbonate: acrylic acid = 1:0.08:0.009:0.045:0.13. After being fully stirred and kneaded to form a paste, it is then rolled and formed. The formed activated carbon is dried and transported to the carbonization area via a belt. The use of adhesives and curing agents helps to increase the strength and stability of the activated carbon. Commonly used adhesives include coal tar, wood tar, clay, etc., and curing agents include zinc chloride, phosphoric acid, sodium hydroxide, etc., while sodium bicarbonate and acrylic acid participate in the reaction, which helps to improve the pore structure and adsorption performance of the activated carbon; S3: Carbonization process, after the impurities are removed and formed, the raw materials are treated in a carbonization furnace (750℃-800℃, time: 24 hours). The raw materials are carbonized by controlling the temperature and time to form amorphous granular carbon blocks; S4: Activation process, activating the above-mentioned amorphous granular carbon blocks into crude activated carbon by water vapor at 900-950°C for 24 hours, strictly controlling the temperature and time; S5: Chlorination process, the crude activated carbon is further chlorinated to remove residual chlorine while retaining its bacteriostatic and antibacterial properties; S6: Cooling, packaging and warehousing process. Products that have passed the chlorination treatment need to be cooled down by a drum cooler, and then sent to the packaging workshop by a belt conveyor and a bucket elevator, where workers will package and seal them.

[0014] The beneficial effects of the present invention are as follows: the preparation device and method of dechlorinated activated carbon, the device, has the characteristics of still having bactericidal and antibacterial properties when the dechlorinated activated carbon adsorption reaches saturation after a period of water purification, and avoids the organic pollutants adsorbed on the surface of the activated carbon being degraded and deteriorated by microorganisms to deteriorate the water quality of the effluent. The dechlorinated activated carbon is made of high-quality coconut shells and the like as raw materials, and is obtained through carbonization (simmering furnace 750℃-800℃), activation (high-temperature steam activation at 950℃-1000℃ in a Slep activation furnace), crushing, screening, air separation, chlorination treatment, water washing, drying and other processes. The activated carbon used for pre-treatment of dechlorination is generally an amorphous granular coconut shell activated carbon with an iodine value of more than 900mg / g, which has the advantages of high mechanical strength, developed pore structure, large specific surface area, fast adsorption speed, and non-toxicity. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 This is a schematic diagram of the appearance of a preparation device for dechlorinated activated carbon in an embodiment of the present invention; Figure 2 This is a schematic diagram of the inner cavity structure of a preparation device for dechlorinated activated carbon in an embodiment of the present invention; Figure 3 It is an enlarged schematic diagram of the structure of the moving ball part in the embodiment of the present invention; Figure 4 It is a schematic diagram of the structure of the rotating rod, the flipping assembly and the gas pushing assembly in the embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the return spring in an embodiment of the present invention; Figure 6 This is a schematic diagram of the connection of the auxiliary moving rod in an embodiment of the present invention; Figure 7 This is a block diagram of the method for preparing dechlorinated activated carbon in an embodiment of the present invention; In the figure, the serial numbers are explained as follows: 1 preparation box, 13 reaction gas inlet pipe, 14 discharge valve, 2 rotating rod, 21 motor, 3 inverted cone filter, 31 cone guide plate, 32 gas hole, 4 slide groove, 41 moving ball, 42 return spring, 5 arc-shaped moving rod, 51 horizontal groove, 52 auxiliary ball, 53 elastic strip, 6 rotating straight rod, 61 arc-shaped flip rod, 7 auxiliary moving rod, 71 arc-shaped auxiliary rod, 72 tilting rod, 73 arc-shaped push plate, 8 deformation ball, 81 piston rod, 82 piston plate. DETAILED DESCRIPTION

[0017] To make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the following is a brief description of the present invention in conjunction with the attached Figure 1-Figure 7 The present invention is further described in detail with reference to the accompanying drawings and specific embodiments.

[0018] A dechlorinated activated carbon preparation device adopted in this embodiment includes a preparation box 1, a support leg 11 is fixedly connected to the bottom outer surface of the preparation box 1, a feed pipe 12 is connected to the side wall of the preparation box 1, a reaction gas inlet pipe 13 is arranged at the bottom central axis of the preparation box 1, one end of the reaction gas inlet pipe 13 passes through the bottom of the preparation box 1 and extends to the inner cavity of the preparation box 1. A discharge valve 14 is connected to the bottom outer wall of the preparation box 1, and an exhaust pipe 15 is connected to the top side of the preparation box 1. A rotating rod 2 is connected to the top central axis of the preparation box 1, one end of the rotating rod 2 passes through the top of the preparation box 1 and extends to the top of the reaction gas inlet pipe 13 located in the inner cavity of the preparation box 1, and a motor 21 is fixedly connected to the other end of the rotating rod 2, and the motor 21 drives the rotating rod 2 to rotate, thereby driving the entire preparation box 1 to rotate.

[0019] An inverted cone-shaped leakage screen 3 is fixedly connected to the outer surface of the extended portion of the reaction gas inlet pipe 13, and one end of the inverted cone-shaped leakage screen 3 away from the reaction gas inlet pipe 13 is fixedly connected to the inner wall of the preparation box 1. A conical guide plate 31 is fixedly connected to the outer surface of the extended portion of the reaction gas inlet pipe 13 directly below the inverted cone-shaped leakage screen 3, and a plurality of gas holes 32 are provided on the reaction gas inlet pipe 13 and the conical guide plate 31.

[0020] In this embodiment, the interior of the rotating rod 2 is hollowed out, and four vertical slide grooves 4 are provided on the side wall of the rotating rod 2. The number of the slide grooves 4 can be set according to actual conditions. In this embodiment, only four are used as an illustration, and the number is not limited. A moving ball 41 is slidably provided at the bottom of the cavity of the rotating rod 2, and the moving ball 41 can move up and down along the inner cavity of the rotating rod 2. A return spring 42 is fixedly connected to the top central axis of the moving ball 41, and the end of the return spring 42 away from the moving ball 41 is fixedly connected to the top inner wall of the rotating rod 2. After the moving ball 41 moves upward under the action of wind force, the return spring 42 provides a pulling force to make the moving ball 41 rebound, so that the moving ball 41 is reset. In this embodiment, a plurality of arc-shaped moving rods 5 are fixedly connected to the side wall of the moving ball 41. The arc-shaped moving rod 5 passes through one end of the slide groove 4 on the rotating rod 2 and is connected to the arc-shaped auxiliary rod 71. Each arc-shaped moving rod 5 is connected to a corresponding arc-shaped auxiliary rod 71, and each arc-shaped moving rod 5 can move up and down in the corresponding slide groove 4 respectively with the moving ball 41.

[0021] The interior of the arc moving rod 5 of this embodiment is hollowed out, and an auxiliary ball 52 is slidably arranged at the middle axis of the hollow interior of the arc moving rod 51. An elastic strip 53 is fixedly connected to the side wall of the auxiliary ball 52, and the auxiliary ball 52 is fixedly connected to the outer surface of the moving ball 41 through the elastic strip 53. An auxiliary moving rod 7 is fixedly connected to the middle axis of the outer surface of the side of the auxiliary ball 52 away from the elastic strip 53, and an arc-shaped auxiliary rod 71 is fixedly connected to the end of the auxiliary moving rod 7 away from the auxiliary ball 52. A rotating straight rod 6 is fixedly connected to the bottom outer wall of the auxiliary ball 52. The rotating straight rod 6 is tilted, and the rotating straight rod 6 passes through the transverse groove 51 at the bottom of the arc moving rod 5 and is connected to the arc-shaped flipping rod 61. The rotating straight rod 6 moves along the transverse groove 51 under the drive of the auxiliary ball 52, and is limited by the transverse groove 51 so that it is always in an eccentric state no matter where it moves. Each rotating straight rod 6 is correspondingly connected to an arc-shaped flipping rod 61, and each arc-shaped flipping rod 61 constitutes a flipping assembly for mixing reactants. The outer surface of the arc-shaped turning rod 61 of the present embodiment is arranged in contact with the inner surface of the inverted cone-shaped screen 3, which is conducive to the arc-shaped turning rod 61 turning the material.

[0022] In this embodiment, a tilting rod 72 is fixedly connected to the central axis of the outer surface of the arc-shaped auxiliary rod 71, and an arc-shaped push plate 73 is fixedly connected to the end of the tilting rod 72 away from the arc-shaped auxiliary rod 71. Each tilting rod 72 is fixedly connected to a piece of arc-shaped push plate 73, and each arc-shaped push plate 73 forms a gas push component that increases the contact area between the material and the reaction gas, wherein the arc-shaped push plate 73 is tiltedly arranged at the top opening of the reaction gas inlet pipe 13. In this embodiment, an extrusion deformation ball 8 is fixedly connected to the bottom of the arc-shaped push plate 73, and the extrusion deformation ball 8 is arranged directly opposite to the top opening of the reaction gas inlet pipe 13. A piston rod 81 is fixedly connected to the central axis of the bottom side outer wall of the extrusion deformation ball 8, and a piston plate 82 is fixedly connected to the end of the piston rod 81 away from the extrusion deformation ball 8. The piston plate 82 is slidably arranged inside the reaction gas inlet pipe 13, and the side wall of the piston plate 82 does not contact the inner wall of the reaction gas inlet pipe 13. After the deformation ball 8 is deformed, the piston plate 82 can squeeze the reaction gas in the reaction gas inlet pipe 13 under the action of the piston rod 81. Under the squeezing action, part of the reaction gas can pass through the gas hole 32, and under the action of the conical guide plate 31, the reaction gas can act on the material passing through the inverted cone filter 3, thereby further increasing the contact area between the material and the reaction gas.

[0023] The dechlorination activated carbon preparation device used in this embodiment has the following working process: Start the motor 21 and introduce the reaction gas at the same time. When the reaction gas enters the device through the reaction gas inlet pipe, the moving ball 41 can drive the arc-shaped moving rod 5 to move up and down under the push of the airflow. The arc-shaped moving rod 5 that moves up and down can make the arc-shaped flipping rod 61 move along the outer surface of the inverted cone filter 3 under the action of the rotating straight rod 6, so that the arc-shaped flipping rod 61 can flip the material.

[0024] During the up and down movement of the arc-shaped moving rod 5, the arc-shaped flipping rod 61 will move up and down. Since the rotating straight rod 6 is inclined, the limiting force of the inverted cone screen 3 on the arc-shaped flipping rod 61 can be eliminated. Under its action, the arc-shaped flipping rod 61 can swing laterally along the inverted cone screen 3 under the action of the rotating straight rod 6 and the auxiliary ball 52, so that the arc-shaped flipping rod 61 can flip the material.

[0025] When the auxiliary ball 52 moves laterally along the inside of the arc-shaped moving rod 5, the auxiliary moving rod 7 will drive the arc-shaped auxiliary rod 71 to move laterally, and under this action, the arc-shaped push plate 73 can move laterally. Since the arc-shaped push plate 73 is arranged at an angle, the arc-shaped push plate 73 can push the reaction gas coming out of the reaction gas inlet pipe 13 to both sides during the lateral movement, thereby increasing the contact area between the material and the reaction gas.

[0026] The lateral movement of the arc-shaped push plate 73 will squeeze the deformed ball 8, and the deformed ball 8 can be deformed under the squeezing effect, and then under the deformation effect, the piston plate 82 can squeeze the reaction gas in the reaction gas inlet pipe 13 under the action of the piston rod 81. Under the squeezing effect, part of the reaction gas can pass through the gas hole 32, and under the action of the conical guide plate 31, the reaction gas can act on the material passing through the inverted cone filter 3, so as to further increase the contact area between the material and the reaction gas.

[0027] The preparation method of a dechlorinated activated carbon preparation device adopted in this embodiment comprises the following steps: S1: Prepare high-quality coconut shells, select and remove impurities, and grind them. During the pickling process, the ratio of coconut shell activated carbon, industrial hydrochloric acid and water is preferably maintained at 10:1:50. This step can effectively clean the impurities in the coconut shell activated carbon and improve its adsorption capacity and use effect. After drying, the pre-treated raw fruit shells are transported to the batching warehouse for storage, and then transported to the molding area; S2: Molding process, the raw fruit shells after pretreatment in the batching bin are fed with appropriate amounts of auxiliary materials (such as adhesives and curing agents, sodium bicarbonate and acrylic acid mixtures) through a quantitative feeder. The mixture ratio refers to the pretreated raw coconut shell: adhesive: curing agent: sodium bicarbonate: acrylic acid = 1:0.08:0.009:0.045:0.13. After being fully stirred and kneaded to form a paste, it is then rolled and formed. The formed activated carbon is dried and transported to the carbonization area via a belt. The use of adhesives and curing agents helps to increase the strength and stability of the activated carbon. Commonly used adhesives include coal tar, wood tar, clay, etc., and curing agents include zinc chloride, phosphoric acid, sodium hydroxide, etc., while sodium bicarbonate and acrylic acid participate in the reaction, which helps to improve the pore structure and adsorption performance of the activated carbon; S3: Carbonization process: After the raw materials are cleaned and formed, they are treated in a carbonization furnace (750℃-800℃, time: 24 hours). The raw materials are carbonized by controlling the temperature and time. 。

[0028] S4: Activation process, the above-mentioned amorphous granular carbon blocks are activated into crude activated carbon by water vapor within 24 hours, and the temperature and time are strictly controlled.

[0029] Start the motor 21 and introduce the reaction gas at the same time. When the reaction gas enters the device through the reaction gas inlet pipe, the moving ball 41 can drive the arc-shaped moving rod 5 to move up and down under the push of the airflow. The arc-shaped moving rod 5 that moves up and down can make the arc-shaped flipping rod 61 move along the outer surface of the inverted cone filter 3 under the action of the rotating straight rod 6, so that the arc-shaped flipping rod 61 can flip the material.

[0030] During the up and down movement of the arc-shaped moving rod 5, the arc-shaped flipping rod 61 will move up and down. Since the rotating straight rod 6 is inclined, the limiting force of the inverted cone screen 3 on the arc-shaped flipping rod 61 can be eliminated. Under its action, the arc-shaped flipping rod 61 can swing laterally along the inverted cone screen 3 under the action of the rotating straight rod 6 and the auxiliary ball 52, so that the arc-shaped flipping rod 61 can flip the material.

[0031] When the auxiliary ball 52 moves laterally along the inside of the arc-shaped moving rod 5, the auxiliary moving rod 7 will drive the arc-shaped auxiliary rod 71 to move laterally, and under this action, the arc-shaped push plate 73 can move laterally. Since the arc-shaped push plate 73 is arranged at an angle, the arc-shaped push plate 73 can push the reaction gas coming out of the reaction gas inlet pipe 13 to both sides during the lateral movement, thereby increasing the contact area between the material and the reaction gas.

[0032] The lateral movement of the arc-shaped push plate 73 will squeeze the deformed ball 8, and the deformed ball 8 can be deformed under the squeezing effect, and then under the deformation effect, the piston plate 82 can squeeze the reaction gas in the reaction gas inlet pipe 13 under the action of the piston rod 81. Under the squeezing effect, part of the reaction gas can pass through the gas hole 32, and under the action of the conical guide plate 31, the reaction gas can act on the material passing through the inverted cone filter 3, so as to further increase the contact area between the material and the reaction gas.

[0033] S5: Chlorination process, the crude activated carbon is then chlorinated, and the crude activated carbon is then exposed to a chlorine or hydrogen chloride environment to cause the oxygen functional groups on the surface of the activated carbon to undergo a chlorination reaction, thereby removing the oxides on the surface, and finally washing and drying to obtain dechlorinated activated carbon that adsorbs sodium hypochlorite. The entire preparation process requires strict control of the parameters of each link to ensure product quality and effect, retaining its ability to remove residual chlorine while maintaining bacteriostatic and antibacterial properties.

[0034] The activated carbon used in pretreatment of chlorine removal is generally an amorphous granular coconut shell activated carbon with an iodine value of more than 900 mg / g. It has the advantages of high mechanical strength, developed pore structure, large specific surface area, fast adsorption speed, and non-toxicity.

[0035] S6: Cooling, packaging and warehousing process. Products that have passed the chlorination treatment need to be cooled down by a drum cooler, and then sent to the packaging workshop by a belt conveyor and a bucket elevator, where workers will package and seal them.

[0036] When designing an activated carbon dechlorination unit, process factors must be considered. If the activated carbon dechlorination unit is designed for both organic and dechlorination, the design criteria for organic removal will override the design criteria for dechlorination.

[0037] Since adsorption of organics onto activated carbon is a slower process than dechlorination, a system designed specifically to remove organics will work well for dechlorination. When designing strictly for dechlorination, consideration must be given to any dissolved organics that may be present in the water. These organics can occupy available dechlorination sites, thereby reducing the dechlorination capacity of the activated carbon.

[0038] Activated carbon particle size is the most important factor affecting dechlorination effectiveness. The smaller the activated carbon particles, the faster the dechlorination rate. The disadvantage of smaller particles is a larger pressure drop within the media bed, so this must be carefully considered in the overall system design. Activated carbon block filters are made of fine-mesh powdered activated carbon with particle sizes primarily ranging from 50 to 325 mesh. Since dechlorination is a chemical reaction, the higher the water temperature, the faster the dechlorination rate. Winter water temperatures in northern climates can cause dechlorination rates to drop by as much as half compared to summer water temperatures. Although the pH of the water cannot usually be adjusted, it does affect the dechlorination rate. As discussed earlier, the pH level will affect the ratio of hypochlorous acid and sodium hypochlorite ions. Since the removal rate for sodium hypochlorite ions is slower than that for hypochlorous acid, water with very high pH will require more activated carbon to adsorb sodium hypochlorite. Going from a neutral pH of 7 to a pH of 9 or 10 requires a 30% to 60% increase in activated carbon for dechlorination.

[0039] Activated carbon with high specific surface area, in order to make up for the poor performance of traditional activated carbon in adsorbing sodium hypochlorite, high-quality high specific surface area and high iodine value activated carbon have been developed after many tests. Compared with traditional activated carbon, they have better ability to adsorb sodium hypochlorite. For surface-enhanced activated carbon, the time of adsorption of sodium hypochlorite can be shortened. In addition to the excellent removal effect of using surface-enhanced coconut shell activated carbon, its higher iodine value means that it also has excellent volatile organic chemicals (VOC s ) adsorption capacity of substances. It also has a lower ash content and higher hardness, which reduces dust. Surface-enhanced coconut shell activated carbon has been experimentally tested to be significantly more suitable than ordinary activated carbon, and the adsorption time is shortened by about three times. Surface-enhanced activated carbon costs more, but based on the lower volume requirements, it is cost-effective compared to traditional activated carbon. Sodium hypochlorite adsorption activated carbon can achieve high specific surface and high iodine value, which is much better than ordinary activated carbon for residual chlorine removal and adsorption of sodium hypochlorite.

[0040] A preparation process of dechlorinated activated carbon, which is made from high-quality coconut shells and other raw materials, through carbonization (stove furnace 750℃-800℃), activation (high-temperature steam activation in Slep activation furnace 950℃-1000℃), crushing, screening, air separation, chlorination treatment, washing, drying and other processes. The activated carbon used for pretreatment and dechlorination is generally an amorphous granular coconut shell activated carbon with an iodine value of more than 900mg / g, which has the advantages of high mechanical strength, developed pore structure, large specific surface area, fast adsorption speed, non-toxic and harmless.

[0041] The dechlorination activated carbon preparation process uses high-quality coconut shells as raw materials, which are carefully selected and removed for carbonization treatment (750℃-800℃, time: 24 hours). The raw materials are carbonized by controlling the temperature and time, and then activated (950℃-1000℃, time: 24 hours). The temperature and time are strictly controlled to generate activated carbon that is crushed into granules.

[0042] After screening and grading, qualified activated carbon enters the next step, which is chlorination treatment. The prepared activated carbon is exposed to a chlorine or hydrogen chloride environment to cause chlorination reaction of oxygen functional groups on the surface of the activated carbon, thereby removing the oxides on the surface. Finally, washing and drying treatment are carried out to finally obtain dechlorinated activated carbon that adsorbs sodium hypochlorite. The parameters of each link in the entire preparation process need to be strictly controlled to ensure product quality and effect.

[0043] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A preparation device for dechlorinated activated carbon, a preparation box (1), characterized in that: The bottom outer surface of the preparation box (1) is fixedly connected to a support leg (11); a feed pipe (12) is connected to the side wall of the preparation box (1); a reaction gas inlet pipe (13) is provided at the bottom center axis of the preparation box (1); the reaction gas inlet pipe (13) passes through the bottom of the preparation box (1) and extends to the inner cavity of the preparation box (1); a discharge valve (14) is connected to the bottom outer wall of the preparation box (1); and an exhaust pipe (15) is connected to the top side of the preparation box (1); A rotating rod (2) is arranged at the central axis of the top of the preparation box (1), the rotating rod (2) passes through the top of the preparation box (1) and extends into the inner cavity of the preparation box (1), and a motor (21) for driving the rotating rod (2) to rotate is fixedly connected to one end of the rotating rod (2) away from the preparation box (1); An inverted cone-shaped leakage net (3) is fixedly connected to the outer surface of the extended portion of the reaction gas inlet pipe (13); one end of the inverted cone-shaped leakage net (3) away from the reaction gas inlet pipe (13) is fixedly connected to the inner wall of the preparation box (1); and a conical guide plate (31) is fixedly connected to the outer surface of the extended portion of the reaction gas inlet pipe (13) located directly below the inverted cone-shaped leakage net (3); and a plurality of gas holes (32) are provided on both the reaction gas inlet pipe (13) and the conical guide plate (31).

2. The preparation device for dechlorinated activated carbon according to claim 1, characterized in that: A moving ball (41) is provided at the bottom of the rotating rod (2). The moving ball (41) is connected to the auxiliary moving rod (7) via an arc moving rod (5). The arc moving rod (5) is also connected to the arc flipping rod (61) via an inclined rotating straight rod (6). Each arc flipping rod (61) constitutes a flipping assembly for material mixing that can swing along the inner surface of the inverted cone-shaped filter screen (3). The moving ball (41) is forced to move up and down along the inner cavity of the rotating rod (2), thereby driving the arc moving rod (5), the auxiliary moving rod (7) and the arc flipping rod (61) to move up and down in turn.

3. The preparation device for dechlorinated activated carbon according to claim 2, characterized in that: A sliding groove (4) is provided on the circumferential direction of the side wall of the rotating rod (2); the moving ball (41) is connected to the top of the rotating rod (2) through a return spring (42); one end of the arc-shaped moving rod (5) connected to the moving ball (41) passes through the sliding groove (4) and is connected to the auxiliary moving rod (7); the other end of the arc-shaped moving rod (5) is connected to the moving ball (41) and moves up and down along the sliding groove (4) driven by the moving ball (41).

4. A preparation device for dechlorinated activated carbon according to claim 2 or 3, characterized in that: The interior of the arc-shaped moving rod (5) is hollowed out, and an auxiliary ball (52) is slidably arranged at the inner central axis of the arc-shaped moving rod (5). The auxiliary ball (52) is connected to the moving ball (41) through an elastic strip (53). The auxiliary ball (52) is connected to the arc-shaped flipping rod (61) through a rotating straight rod (6). A transverse groove (51) is provided on the bottom side of the arc-shaped moving rod (5). One end of the rotating straight rod (6) connected to the auxiliary ball (52) passes through the transverse groove (51) and is connected to the arc-shaped flipping rod (61). The auxiliary ball (52) is limited by the transverse groove (51). The outer surface of the arc-shaped flipping rod (61) is arranged to contact the outer surface of the inverted cone-shaped leakage net (3).

5. The preparation device of a dechlorinated activated carbon according to claim 4, characterized in that: The auxiliary ball (52) is connected to the auxiliary moving rod (7) via an elastic strip (53); the auxiliary moving rod (7) is connected to one end of the tilting rod (72) via an arc-shaped auxiliary rod (71); the other end of the tilting rod (72) is connected to an arc-shaped pushing plate (73); each arc-shaped pushing plate (73) is arranged obliquely at the top opening of the reaction gas inlet pipe (13); each arc-shaped pushing plate (73) constitutes a pushing component for moving the gas coming out of the reaction gas inlet pipe (13) to both sides.

6. The preparation device of a dechlorinated activated carbon according to claim 5, characterized in that: The bottom of the arc-shaped pushing plate (73) is on the extrusion deformation ball (8), and the extrusion deformation ball (8) is arranged facing the top opening of the reaction gas inlet pipe (13). The extrusion deformation ball (8) is connected to the piston plate (82) through a piston rod (81).

7. The preparation device of a dechlorinated activated carbon according to claim 6, characterized in that: The piston plate (82) is arranged inside the reaction gas inlet pipe (13), and the side wall of the piston plate (82) does not contact the inner wall of the reaction gas inlet pipe (13).

8. A method for preparing dechlorinated activated carbon, using the device as claimed in claim 1, characterized in that: The steps include: S1: Prepare high-quality coconut shells, select and remove impurities, and grind them. During the pickling process, the ratio of coconut shell activated carbon, industrial hydrochloric acid and water is maintained at 10:1:

50. After this step, impurities in coconut shell activated carbon are effectively cleaned, and its adsorption capacity and use effect are improved; after drying, the pre-treated raw fruit shells are transported to the batching warehouse for storage, and then transported to the molding area; S2: Molding process, the raw fruit shells after pretreatment in the batching bin are mixed with appropriate amounts of auxiliary materials through a quantitative feeder, and the mixed material ratio refers to the raw coconut shell after pretreatment: adhesive: curing agent: sodium bicarbonate: acrylic acid = 1:0.08:0.009:0.045:0.

13. After being fully stirred and kneaded to form a paste, it is then rolled and formed. The formed activated carbon is dried and transported to the carbonization area via a belt. The use of adhesives and curing agents helps to increase the strength and stability of the activated carbon. Commonly used adhesives include coal tar, wood tar, clay, etc., and curing agents include zinc chloride, phosphoric acid, sodium hydroxide, etc., while sodium bicarbonate and acrylic acid participate in the reaction, which helps to improve the pore structure and adsorption performance of the activated carbon; S3: Carbonization process, after the raw materials are selected and impurities are removed and formed, they are treated in a carbonization furnace at 750℃-800℃ for 24 hours. The raw materials are carbonized by controlling the temperature and time to form amorphous granular carbon blocks; S4: Activation process, activating the above-mentioned amorphous granular carbon blocks into crude activated carbon by water vapor at 900-950°C for 24 hours, strictly controlling the temperature and time; S5: Chlorination process, the crude activated carbon is further chlorinated to remove residual chlorine while retaining its bacteriostatic and antibacterial properties; S6: Cooling, packaging and warehousing process. Products that have passed the chlorination treatment need to be cooled down by a drum cooler, and then sent to the packaging workshop by a belt conveyor and a bucket elevator, where workers will package and seal them.

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