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Effect Of Plastic Pyrolysis On The Preparation Of Activated Carbon From Municipal Organic Waste
Aug 02, 2017

The role of plastic pyrolysis in the preparation of activated carbon from municipal organic waste Ji Liping, Lin Weigang, Yang Xuemin (Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080) Ming: In the process of preparing the material strip, the plastic pyrolysis has lubrication, the bonding effect can effectively reduce the amount of tar binder; in the carbonization stage of the material strip, the carbonization material has a well-developed pore (closed) structure because of the pyrolysis and precipitation of the plastic pyrolysis material, which eventually accelerates the activation reaction speed in the subsequent activation process. The adsorption properties of activated carbon were improved, and the plastic pyrolysis material had a certain regulative effect during the formation and development of activated carbon pore structure.
The direct incineration of MSW is an effective means to realize the energy-reducing and reduction of municipal refuse, and it is adopted by all countries in the world. However, there are two major problems in the direct incineration of rubbish, the first is that in the process of waste incineration will produce two of the excessive emission of dioxin, serious pollution of the environment; The second is because the composition of the different components of the garbage is very different, so the direct incineration of garbage will be difficult for the design of the incinerator, resulting in the incineration efficiency of the waste. In view of the environmental pollution caused by dioxins, the method of using activated carbon to absorb dioxins is 112, and the effective way to solve the second problem is to use the conclusions of the research institute in recent years to get a new idea 13-51. New thinking, although the composition of the various components of garbage is very different, but the use of the composition of the pyrolysis gas in the waste of the very similar, so that the first pyrolysis of refuse incineration will greatly improve the utilization of waste, more favorable than direct combustion.
In the composition of urban waste, wood, paper and plastic are three typical solid organic wastes, which not only have the characteristics of low ash and high carbon content, therefore, compared with other waste components such as household kitchen 16, it is more suitable to be used as raw material for preparing activated carbon, and the pyrolysis products of three kinds of wastes are more easily broken than the waste itself when the pyrolysis is not carried out, making the process of preparing granular activated carbon from pyrolysis as raw material becomes easier Therefore, three kinds of typical organic waste pyrolysis materials, the preparation of active carbon suitable for removing dioxins can not only eliminate the pollution caused by MSW incineration, but also can enlarge the raw material source of activated carbon production by 17, so as to improve the comprehensive utilization of waste energy.
Based on the study of the preparation of activated carbon from solid organic waste pyrolysis materials, I have not yet seen the report.
By visible, plastic pyrolysis in the temperature of about 440C rapid pyrolysis and precipitation of volatile, temperature reached 500C or so, the plastic pyrolysis of almost all the pyrolysis precipitation; the mixture of charcoal and paper charcoal is slow in the 0c~500c range, and the pyrolysis rate becomes relatively fast when 500C above.
The results show that the mixture of two kinds of pyrolysis materials of different plastics increases the activation grate and Shan: the higher the content of the carbon progenitor! The more the void in the bucket is in the activation process, the less the mixture is, the pyrolysis weight loss rate starts faster than the mass fraction of 20%, and when the temperature rises further to the 440°c~5⑴°c, the mass fraction is 30%. The pyrolysis weight loss rate of the mixture was faster than that of the mass fraction of 20%. At the same time, the pyrolysis behavior of two kinds of pyrolysis compounds in the hot decomposition solution at the temperature range is more consistent than 500C. The pyrolysis speed is obviously slow, but slightly faster than the pyrolysis rate of charcoal and paper-carbon mixtures, which can be inferred that there is still a small amount of decomposed plastic pyrolysis materials in the continuation of decomposition; the weighted average calculation of pyrolysis of plastic pyrolysis, charcoal and paper carbon mixtures was carried out. It was found that the pyrolysis weighted average of the mixture of two different plastic pyrolysis contents was basically consistent with the corresponding actual pyrolysis weight loss rate.
And it is known that, under the same activation condition, the iodine adsorption value of the plastic pyrolysis material increases significantly. The results show that the increase of the content of the plastic pyrolysis material can accelerate the activation reaction speed and improve the adsorption ability of activated carbon. In combination with Carbonization, No. 4 is the result of the pore structure determination of the carbonized strip with a mass fraction of 20% of the plastic pyrolysis material at a lower burn rate.
By No. ~no. 3 in table 4, the content of the pyrolysis material in the waste pyrolysis material is mainly affected by the formation and development of the pores in the activated carbon. When the content of the pyrolysis material increases, the specific surface area, the total pore and the micropore of the activated carbon show the change law of the first increase and decrease, while the micro-micropore is always decreasing, but the change is much smaller than that of the micropore.
Table 4 Effect of the content of pyrolysis material on the pore structure of activated carbon the Gallo £ Cheng of the raw material of three kinds of waste pyrolysis materials prepared by activated carbon. Preparation of living resources to develop new carbon materials, the results of No. 2 and No. 4 in Bookmark10 table 4 reflect the change of activated carbon pore structure during activation. When the burning loss rate is low (36.9% of No. 4), the activated carbon is very high in the middle pore, which indicates that the voids left after the pyrolysis of the plastic material are activated and the pores are formed. The Micropore and Micropore are increased with the activation (e.g. No. 68), and the increase in Micropore is larger than that of the micropore, indicating that with the activation, a considerable amount of micropore becomes the middle hole, That is, a considerable portion of the thin pores of the wall are activated and burned into the middle hole, while the new pores are accompanied by the production. Therefore, the effect of plastic pyrolysis on the structure of activated carbon in the process of carbonization and activation of the material is explained as follows: The higher the content of the plastic pyrolysis, the richer the pore the thinner the wall, the faster the activation speed, and the faster the activation speed is not only conducive to the thin micro-pores merged into a hole, but also in the activation process to generate new pores, the results of the activated carbon Micropore with the increase in the content of plastic pyrolysis. But the micro-micropore is always decreasing, but the decrease amplitude is small, when the plastic pyrolysis content is too high, it causes a part of the middle hole to become the big hole, therefore the middle Micropore reduces again.
In this paper, the pore structure of activated carbon can be adjusted to a certain extent by changing the content of the pyrolysis material in the waste pyrolysis material.
Conclusion the pyrolysis behavior of °q is not only made by pyrolysis of plastics, but also by pyrolysis of plastic pyrolysis materials in the process of carbonization. It accelerates the activation reaction speed and has a certain regulative effect on the formation and development of the pore structure of activated carbon, and thus enhances the adsorption performance of activated carbon. In addition, the plastic pyrolysis has a certain degree of adhesion, which can reduce the molding pressure of the strip and reduce the tar dosage.