CN212595752U - System for regeneration of waste activated carbon - Google Patents
System for regeneration of waste activated carbon Download PDFInfo
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- CN212595752U CN212595752U CN202020774661.0U CN202020774661U CN212595752U CN 212595752 U CN212595752 U CN 212595752U CN 202020774661 U CN202020774661 U CN 202020774661U CN 212595752 U CN212595752 U CN 212595752U
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Abstract
The utility model belongs to the technical field of active carbon manufacturing, and relates to an active carbon regeneration treatment device and a preparation method, in particular to a waste active carbon regeneration system, which comprises a waste active carbon treatment unit, a drying carbonization unit and a finished product cooling unit which are sequentially installed, wherein the waste active carbon treatment unit is used for leading in waste active carbon and screening, mixing, neutralizing and washing the waste active carbon; drying, carbonizing and activating the particles by a drying and carbonizing unit to form a high-temperature finished product; and cooling the high-temperature finished product by a finished product cooling unit to form a finished product.
Description
Technical Field
The utility model belongs to the technical field of the active carbon is made, a device, especially a system of useless active carbon regeneration that active carbon regeneration was handled is related to.
Background
The active carbon is made up by using high-quality wood dust, coconut shell and coal as raw material through a series of processes. The internal microporous structure of the activated carbon is developed, and the specific surface area reaches 1000-1500 m2(iv) is an adsorbent material with strong adsorption capacity (fan, Guping, et al. [ J ] J]Industrial water treatment, 2014.04). The activated carbon has the advantages of high filtering speed, good adsorption performance, strong decoloring and deodorizing capabilities, economy, durability and the like, is widely applied to industries such as food, beverage, medicine, tap water, sugar, grease and the like, and is also commonly applied in the fields of wine brewing, sewage treatment, power plants, electroplating and the like (taken from hundred-degree encyclopedias). Although activated carbon is widely used in adsorption processes, its industrial application presents drawbacks mainly depending on the nature of the contaminants adsorbed thereon, and in particular on the ease with which they can be desorbed. Once its adsorptive capacity is exhausted, the activated carbon can be deposited in landfills, incinerated, or regenerated for reuse. However, due to increasing concerns about the environmental impact of pollutants and stricter environmental standards, disposal of hazardous waste in landfills has become increasingly unacceptable (bang. [ D ])]Industrial regeneration of powdered activated carbon and its use, university of china metering, 2017). Because the particle size of the powdered activated carbon is small, the problems that the powdered activated carbon has high water content and is difficult to separate from sludge and the like during regeneration are faced, and meanwhile, the powdered characteristic of the powdered activated carbon prevents gas purging from being adopted in the regeneration process.
China is the biggest wood activated carbon production base in the world, but from the industrial structure, most wood activated carbon plants in China are small enterprises producing hundreds of tons to thousands of tons every year. Although two or three hundred wood activated carbon enterprises exist in the whole country at present, the annual production capacity really reaches the index of thousands of tons. Along with the continuous development of economy and the gradual improvement of the living standard of people, the application of the activated carbon is more and more emphasized by people, particularly along with the continuous increase of environmental protection strength in recent years, the demand of the domestic activated carbon is continuously increased, the export is also increased year by year, and the development of the activated carbon industry is very vigorous.
Background of the regeneration technology:
the activated carbon regeneration process can be carried out in two different ways. The first involves regeneration based only on desorption of adsorbed compounds without reaction of the activated carbon, requiring only mass transport from one phase (activated carbon surface) to the other. The second type, based on the decomposition and regeneration of the pollutants adsorbed on the activated carbon, involves decomposition reactions with the possibility of completely mineralizing the pollutants.
(1) Thermal regeneration
The thermal regeneration method is to make the adsorbate in the activated carbon heated, desorbed and decomposed in a heating mode, so as to recover the adsorption capacity of the activated carbon. The principle of heat regeneration is as follows: the temperature of the saturated activated carbon is raised by adopting an external heating method, so that the adsorption balance between the saturated activated carbon and the adsorbate is broken, and the adsorbate on the saturated activated carbon is desorbed or desorbed.
The advantages of the thermal regeneration of the activated carbon are as follows: high regeneration efficiency, wide application range, short regeneration time and the like, and is one of the few methods which can carry out large-scale, mechanized and industrialized activated carbon regeneration at present. Disadvantages of thermal regeneration of activated carbon: high energy consumption and large carbon loss, about 20 percent.
(2) Chemical reagent regeneration
The regeneration of the chemical reagent is to use a special chemical reagent to desorb or decompose the adsorbate so as to recover the adsorption capacity of the activated carbon. Acids and bases are the most commonly used inorganic chemical regeneration agents, and organic regeneration agents are generally organic solvents with strong dissolving power. The time for chemical regeneration is relatively short and there is little loss of char. The regeneration efficiency of the chemical agent mainly depends on the solubility of the adsorbate in the solvent and the strength of the interaction force between the adsorbate and the activated carbon. The biggest defects of the regeneration of the chemical reagent are that a large amount of waste liquid is generated in the regeneration process and needs to be further treated, and the adsorption capacity of the activated carbon after regeneration is recovered to be limited.
(3) Electrochemical regeneration
Electrochemical regeneration transfers polar ions or analysis in electrolyte (activated carbon solution) to the surface of an electrode by an external electric field, and the substances are oxidized or reduced on the surface of the electrode, so that the adsorption capacity of the activated carbon is recovered. The electrochemical regeneration efficiency can reach more than 95 percent.
The electrochemical regeneration can be carried out at normal temperature, no chemical reagent is needed to be added, the adsorbed pollutants are decomposed in situ in the regeneration process, the structure and the characteristics of the activated carbon cannot be damaged, the carbon loss hardly exists, and the regeneration efficiency is considerable. However, this method has the disadvantage of high energy consumption.
(4) Wet oxidation regeneration
The wet oxidation regeneration is to oxidize adsorbate in the waste activated carbon by oxygen or air in an aqueous solution at the temperature of 150-200 ℃ and the pressure of 1-5MPa to desorb, so as to recover the adsorption performance of the activated carbon. The wet oxidation regeneration is also divided into two steps, wherein the first step is that impurities adsorbed on the surface of the active carbon are replaced into the bulk solution by water molecules, and the second step is that the desorbed impurities are oxidized by oxygen or air in the bulk solution. The wet oxidation regeneration is applicable to the waste active carbon in the water treatment industry. Metal and oxide thereof are added as catalyst in the wet oxidation regeneration process, so that the regeneration temperature and pressure can be reduced, and the equipment operation cost is reduced; however, the carbon deposition occurring during the regeneration process affects the activity of the catalyst, and the metal leaching causes secondary pollution.
(5) Ultrasonic wave regeneration
The process of ultrasonic wave propagation in water solution has high energy cavitation effect, and the cavitation bubble undergoes three stages of generation, growth and explosion in the solution. The rupture of the cavitation bubbles can form local high temperature and high pressure at the original position, so that water molecules are decomposed to generate OH free radicals and generate high-speed micro-jet and high-pressure shock waves to cause collision among high-speed particles. Meanwhile, the ultrasonic wave generates vortex in the active carbon hole and on the solid-liquid interface. Therefore, the organic contaminants adsorbed in the waste activated carbon are effectively decomposed by thermal decomposition and oxidation. Ultrasonic radiation can enhance the destruction of chemical bonds between the adsorbate and the activated carbon.
At present, the thermal regeneration method is a mature technology with the widest application range and the highest input utilization rate, but still has the defects of high energy consumption and high carbon loss rate. The novel purpose of this use is perfect on prior art's basis, reduces energy loss and the charcoal loss in the active carbon regeneration process, improves regeneration efficiency.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's not enough, provide an active carbon regenerating unit to a regeneration method of using the device is provided, can reduce the energy consumption in the thermal regeneration process through this method, reduce the charcoal loss, reduce exhaust emissions, promote regeneration efficiency.
The utility model adopts the technical proposal that:
a system for regeneration of waste activated carbon is characterized in that: the system comprises a waste active carbon treatment unit, a drying carbonization unit and a finished product cooling unit which are sequentially installed, wherein the waste active carbon treatment unit is used for introducing waste active carbon, and screening, mixing, neutralizing and washing the waste active carbon; drying, carbonizing and activating the particles by a drying and carbonizing unit to form a high-temperature finished product; and cooling the high-temperature finished product by a finished product cooling unit to form a finished product.
Further, the mountable mixes a grain unit between useless activated carbon processing unit and the dry carbomorphism unit, when the feeding is powdered carbon, wherein mix a grain unit and include blender and grain machine, wherein the leading-in secondary raw materials of feed end of blender, install the material jar in this blender, the material jar can be to leading-in adhesive in the blender, the discharge end of blender switches on with the feed end of grain machine, and the discharge end of this grain machine is derived the extrusion and is formed semi-manufactured goods granule.
Further, the waste activated carbon treatment unit comprises a mixing device and a washing device, the pretreatment device comprises a screening machine, a water storage tank and a mixing pool, and the washing device comprises a waste carbon storage tank, an acid liquor storage tank, an alkali liquor storage tank and a filtering device; the feed end of screening machine is used for leading-in useless active carbon, and the tank embeds there is water, and the discharge end of this screening machine and tank switches on with the feed end of hybrid pool respectively, and useless active carbon and water mix in the hybrid pool, and the discharge end and the useless carbon storage tank of this hybrid pool switch on, useless carbon storage tank still switches on with the discharge end of acidizing fluid storage tank and alkali lye storage tank, and the discharge end of useless carbon storage tank and filter equipment's filtration front end switch on, filter equipment filters the rear end and switches on with outside clear water, forms the secondary raw materials after the washing.
Furthermore, exhaust ends of the sieving machine, the mixing tank and the waste carbon storage tank are communicated with a waste gas treatment system, and dust generated by the sieving machine and the mixing tank is treated by a dust remover and then is led into the waste gas treatment system; waste gas that the useless carbon storage tank produced is leading-in exhaust treatment system, exhaust treatment system switches on vapor and combustible gas with dry carbomorphism unit respectively.
Furthermore, the drying and carbonizing unit comprises a rotary kiln and a rake furnace, wherein the feeding end of the rotary kiln is used for guiding the semi-finished product particles, and the discharging end of the rotary kiln is communicated with the feeding end of the rake furnace.
Further, the flue gas of the rake furnace is introduced into the rotary kiln to be used as a heat source.
Further, finished product cooling unit includes water-cooled cylinder and finished product storage tank, and the high temperature finished product switches on with the feed end of water-cooled cylinder, and the discharge end of water-cooled cylinder switches on with the feed end of finished product storage tank, and the finished product storage tank can have branch material and ejection of compact function concurrently.
The utility model has the advantages that:
1. the utility model discloses in, adopt useless active carbon processing unit, dry carbomorphism unit and finished product cooling unit to combine together, form one set of new active carbon regeneration system, design out corresponding regeneration method based on above-mentioned system and can sieve, mix, neutralize, washing, drying, carbomorphism, activation, processes such as cooling with the useless active carbon that comes of collecting, realize the regeneration of active carbon, this regeneration in-process can realize reducing the charcoal loss, the heat loss, the design requirement that regeneration efficiency is high.
2. In the utility model, if the feed is granular carbon, the waste granular treatment unit and the drying carbonization unit are matched to form granular regenerated active carbon; the design requirement in the actual production can install additional between useless activated carbon processing unit and dry carbomorphism unit and mix out a grain unit for handle useless powder activated carbon, and then can form the finished product of particulate state, satisfy different production requirements. In addition, the blender and the granulator are matched, the adhesive is doped in the mixing process, so that the powdered carbon and the adhesive are fully mixed, particles with larger particle size, uniform texture and low water content are extruded, and the particles can directly enter a subsequent rake furnace for activation and carbonization, thereby reducing the carbon loss. Compared with the prior art, the carbon loss of the device can be controlled to be about 10%.
3. The utility model discloses in, screening machine, water storage tank and mixing tank cooperation, useless carbon storage tank, acidizing fluid storage tank, alkali lye storage tank and filter equipment cooperation realize carrying out neutralization, washing and filtering with useless active carbon and preparing the raw materials that the active carbon is regenerated to useless active carbon's processing.
4. The utility model discloses in, the front end that adopts the rake type stove sets up the rotary kiln, carries out the predrying to semi-manufactured goods granule, and the high temperature flue gas that the rotary kiln produced with the rake type stove carries out indirect heating to semi-manufactured goods granule as the heat source, need not to match extra heat source, and activation in the rake type stove of semi-manufactured goods granule after the predrying, the efficiency of carbomorphism also can corresponding improvement, and then realizes reducing the heat loss, promotes regeneration efficiency's design purpose.
5. The utility model discloses in, the water-cooling cylinder is used for carrying out rapid cooling to the high temperature finished product to finally keep in or the partial shipment in the finished product storage tank.
6. In the invention, the exhaust ends of the sieving machine, the mixing tank and the waste carbon storage tank are communicated with the air inlet end of a waste gas treatment system, so that dust, acid gas, alkaline gas, water vapor and other combustible and combustion-supporting gas generated in the regeneration process are collected, the dust is guided into the waste gas treatment system through the dust remover to be collected, the intensively collected dust can be recycled to the production process again, the carbon loss is further reduced, and the water vapor generated in the waste gas treatment system can be guided into the rake furnace to participate in the water gas reaction, so that the activated carbon is activated and perforated, and the adsorption performance of the activated carbon is further recovered.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The present invention is further illustrated by the following examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.
Example 1:
the utility model provides a system for useless active carbon regeneration, the innovation of the utility model lies in, including the useless active carbon processing unit, dry carbomorphism unit and the finished product cooling unit of installing in order, useless active carbon processing unit is used for leading-in useless granule active carbon to carry out screening, mixing, neutralization and washing to useless granule active carbon; drying, carbonizing and activating the particles by a drying and carbonizing unit to form a high-temperature finished product; and cooling the high-temperature finished product by a finished product cooling unit to form a finished product.
Example 2:
the utility model provides a system for regeneration of useless active carbon, the innovation of the utility model lies in, including the useless active carbon processing unit, the mixed grain unit that goes out, dry carbomorphism unit and the finished product cooling unit that install in order, useless active carbon processing unit is used for leading in useless powder active carbon to carry out screening, mixing, neutralization and washing to useless powder; mixing the washed secondary raw materials, granulating, adding an adhesive, and extruding to form semi-finished product granules; drying, carbonizing and activating the particles by a drying and carbonizing unit to form a high-temperature finished product; and cooling the high-temperature finished product by a finished product cooling unit to form a finished product.
In this embodiment, the mixing and discharging device includes a mixer 11 and a discharging machine 15, wherein the feeding end of the mixer introduces the secondary raw material, a charging bucket 12 is installed in the mixer, the charging bucket can introduce the adhesive into the mixer, the discharging end of the mixer is communicated with the feeding end of the discharging machine, and the discharging end of the discharging machine leads out the semi-finished particles formed by extrusion.
The specific implementation structures of the waste activated carbon treatment unit, the drying carbonization unit and the finished product cooling unit in the two embodiments are as follows.
In this embodiment, the waste activated carbon treatment unit includes a mixing device and a washing device, the pretreatment device includes a sieving machine 1, a water storage tank 3 and a mixing tank 2, wherein the water storage tank and the washing device include a waste carbon storage tank 8, an acid liquor storage tank, an alkali liquor storage tank 9 and a filtering device 6; the feed end of screening machine is used for leading-in useless active carbon, and the tank embeds there is water, and the discharge end of this screening machine and tank switches on with the feed end of hybrid pool respectively, and useless active carbon and water mix in the hybrid pool, and the discharge end of this hybrid pool switches on through pump machine 7 and useless carbon storage tank, useless carbon storage tank still switches on with the discharge end of acidizing fluid storage tank and alkali lye storage tank, and the discharge end of useless carbon storage tank and filter equipment's filtration front end switch on, filter equipment's filtration rear end switches on with outside clear water, forms secondary raw materials after the washing.
In this embodiment, the water storage tank adopt the overflow water pitcher, the play water end and the mixing tank of this overflow water pitcher switch on, the play water end of filter equipment and useless carbon storage tank switches on with the end of intaking of overflow water pitcher, this overflow water pipe still is provided with the drain, the drain switches on with waste liquid treatment system.
In this embodiment, the discharging 5 of the filtering device is provided with a spiral discharging machine 4, and the secondary raw material is conveyed to the scraper belt 10 below through the spiral discharging machine and conveyed to the mixer through the scraper belt.
In this embodiment, the exhaust ends of the sieving machine, the mixing tank and the waste carbon storage tank are all communicated with a waste gas treatment system, wherein dust generated by the sieving machine and the mixing tank is treated by the dust remover 24 and then is introduced into the waste gas treatment system; and the water vapor generated by the waste carbon storage tank is led into a waste gas treatment system, and the waste gas treatment system conducts the water vapor and the combustible gas with the drying and carbonizing unit respectively.
In this embodiment, the upstream end of a belt conveyor 13 is installed to the discharge gate below of material jar, and this belt conveyor's downstream section switches on with the feed inlet of blender. The viscous powder mixed in the mixer is conveyed to the feeding end of a granulator through a belt 14 of a separating machine for extrusion molding, wherein the granulator preferably adopts a double-screw granulator, a scraper 16 is arranged at the discharging position of the double-screw granulator to cut the strip-shaped semi-finished products into proper particles, and a processing position below the scraper is provided with a feed hopper 17 of a rotary kiln.
In this embodiment, the drying and carbonizing unit includes a rotary kiln 18 and a rake furnace 20, a feeding end of the rotary kiln is used for guiding the semi-finished particles, and a discharging end of the rotary kiln is communicated with a feeding end 19 of the rake furnace.
In this embodiment, the flue gas of the rake furnace is introduced into the rotary kiln as a heat source.
In this embodiment, finished product cooling unit includes water-cooled cylinder 21 and finished product storage tank 23, and the high temperature finished product switches on with water-cooled cylinder's feed end, and water-cooled cylinder's discharge end switches on with the feed end of finished product storage tank through scraper belt 22, and the finished product storage tank can have branch material concurrently and the ejection of compact function.
The utility model discloses a use is:
the utility model discloses during the structure of applied embodiment 1, including following step:
step 1: screening the waste active carbon;
step 2: mixing the screened active carbon and water to form a mixed solution;
and step 3: adding an acidic substance and an alkaline substance according to the pH value of the mixed solution for neutralization; in the step 3, the pH value of the neutralized mixed solution is 6-9, and the salinity is not higher than 1 percent
And 4, step 4: filtering the neutralized mixed solution to realize solid-liquid separation, and washing a solid part to form a secondary raw material;
and 5: the semi-finished product is dried and thermally regenerated to realize carbonization and activation to form a high-temperature finished product;
step 6: and (4) rapidly cooling the high-temperature finished product, and storing or discharging after the temperature is reduced from 700 ℃ to below 100 ℃.
The utility model discloses, include following step when using embodiment 2:
step 1: screening the waste powder;
step 2: mixing the sieved powder with water to form a mixed solution;
and step 3: adding an acidic substance and an alkaline substance according to the pH value of the mixed solution for neutralization; in the step 3, the pH value of the neutralized mixed solution is 6-9, and the salinity is not higher than 1 percent
And 4, step 4: filtering the neutralized mixed solution to realize solid-liquid separation, and washing a solid part to form a secondary raw material;
and 5: the secondary raw material mixed adhesive is formed into semi-finished product particles through a particle discharging machine;
step 6: the semi-finished product is dried and thermally regenerated to realize carbonization and activation to form a high-temperature finished product;
and 7: and (4) rapidly cooling the high-temperature finished product, and storing or discharging after the temperature is reduced from 700 ℃ to below 100 ℃.
The utility model discloses in, at the screening machine, the exhaust end of mixing tank and useless carbon storage tank all switches on with an exhaust-gas treatment system's inlet end, carry out the dust that produces in the regeneration process, acid gas, alkaline gas, vapor and other flammable, combustion-supporting gas is collected, the dust is collected through the leading-in exhaust-gas treatment system of dust remover, and concentrate the dust of collecting and can circulate to the production process once more, further reduce the charcoal loss, and the vapor that produces among the exhaust-gas treatment system then can lead into harrow formula stove and participate in the water gas reaction, activate the trompil to the active carbon, in order to further resume its adsorption performance.
Claims (7)
1. A system for regeneration of waste activated carbon is characterized in that: the system comprises a waste active carbon treatment unit, a drying carbonization unit and a finished product cooling unit which are sequentially installed, wherein the waste active carbon treatment unit is used for introducing waste active carbon, and screening, mixing, neutralizing and washing the waste active carbon; drying, carbonizing and activating the particles by a drying and carbonizing unit to form a high-temperature finished product; and cooling the high-temperature finished product by a finished product cooling unit to form a finished product.
2. A system for spent activated carbon regeneration as defined in claim 1, wherein: the mountable mixes out a unit between useless activated carbon processing unit and the dry carbomorphism unit, wherein mix out a unit and include blender and grain machine, wherein the leading-in secondary raw materials of feed end of blender, install the material jar in this blender, the material jar can be to leading-in adhesive in the blender, the discharge end of blender switches on with the feed end of grain machine, and the discharge end of this grain machine is derived the extrusion and is formed semi-manufactured goods granule.
3. A system for spent activated carbon regeneration as defined in claim 1 or 2 wherein: the waste activated carbon treatment unit comprises a mixing device and a washing device, the waste activated carbon treatment unit comprises a screening machine, a water storage tank and a mixing tank, and the washing device comprises a waste carbon storage tank, an acid liquor storage tank, an alkali liquor storage tank and a filtering device; the feed end of screening machine is used for leading-in useless active carbon, and the tank embeds there is water, and the discharge end of this screening machine and tank switches on with the feed end of hybrid pool respectively, and useless active carbon and water mix in the hybrid pool, and the discharge end and the useless carbon storage tank of this hybrid pool switch on, useless carbon storage tank still switches on with the discharge end of acidizing fluid storage tank and alkali lye storage tank, and the discharge end of useless carbon storage tank and filter equipment's filtration front end switch on, filter equipment filters the rear end and switches on with outside clear water, forms the secondary raw materials after the washing.
4. A system for spent activated carbon regeneration as defined in claim 3, wherein: the exhaust ends of the sieving machine, the mixing tank and the waste carbon storage tank are communicated with a waste gas treatment system, wherein dust generated by the sieving machine and the mixing tank is treated by a dust remover and then is introduced into the waste gas treatment system; waste gas that the useless carbon storage tank produced is leading-in exhaust treatment system, exhaust treatment system switches on vapor and combustible gas with dry carbomorphism unit respectively.
5. A system for spent activated carbon regeneration as defined in claim 1 or 2 wherein: the drying and carbonizing unit comprises a rotary kiln and a rake furnace, wherein the feeding end of the rotary kiln is used for guiding in the semi-finished product particles, and the discharging end of the rotary kiln is communicated with the feeding end of the rake furnace.
6. A system for spent activated carbon regeneration as defined in claim 5, wherein: and the flue gas of the rake furnace is introduced into the rotary kiln to be used as a heat source.
7. A system for spent activated carbon regeneration as defined in claim 1 or 2 wherein: finished product cooling unit includes water-cooled drum and finished product storage tank, and the high temperature finished product switches on with the feed end of water-cooled drum, and the discharge end of water-cooled drum switches on with the feed end of finished product storage tank, and the finished product storage tank can have branch material concurrently and the ejection of compact function.
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| CN111889089A (en) * | 2020-05-12 | 2020-11-06 | 天津天一爱拓科技有限公司 | System and method for regenerating waste activated carbon |
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