Sulphur distribution in the products of waste tire pyrolysis

2013 ◽  
Vol 67 (12) ◽  
Author(s):  
Dalibor Susa ◽  
Juma Haydary
Keyword(s):  
Residence Time ◽  
Sulphur Content ◽  
Environmental Concerns ◽  
Volatile Fraction ◽  
Environmental Standards ◽  
Influence Of Process Parameters ◽  
Pyrolysis Products ◽  
Waste Tire ◽  
Reaction Unit ◽  
Waste Tire Recycling

AbstractThe aim of the presented work was to investigate the distribution of sulphur in tire pyrolysis products as well as the influence of process parameters (temperature and residence time) on sulphur distribution due to environmental concerns. Among modern methods used for waste tire recycling, pyrolysis is one of the most reasonable alternatives meeting current environmental standards. However, waste tire sulphur content can be a potential drawback for pyrolysis products utilisation as fuels. Sulphur is present in tires in different concentrations, depending on the type and age of the tires. Typical sulphur content in tires is about 1.6 mass %. In this paper, the distribution of sulphur in tire pyrolysis products was investigated. Tire pyrolysis yields three different products: liquid, gaseous, and solid residue composed mostly of carbon black (chars). Temperature and residence time are the two most important parameters affecting the yield and composition of the volatile fraction and they are therefore expected to affect the sulphur content in residues. Pyrolysis experiments were carried out in a laboratory pyrolysis reaction unit in the temperature range of 650°C to 750°C at different residence times: 88.6 s, 80.2 s, and 73.9 s. Liquid and solid products were analysed by elemental analysis and the distribution of total sulphur in tire pyrolysis products was calculated.

scholarly journals Multi-objective optimization model of waste tire recycling network

2020 ◽  
Vol 214 ◽  
pp. 03052
Author(s):  
Bin Wang ◽  
HeHua Li
Keyword(s):  
Environmental Protection ◽  
Customer Service ◽  
Service Level ◽  
Decision Variable ◽  
Multi Objective ◽  
Waste Tire ◽  
Multi Objective Programming ◽  
Customer Service Level ◽  
Logistics Enterprises ◽  
Waste Tire Recycling

To achieve sustainable development, logistics enterprises need not only to reduce costs, but also to save energy for environmental protection and improve customer service level. The improvement of reverse logistics management level of waste tires is of great significance to improve the efficiency of the automobile industry. In this paper, multi-objective programming is adopted to establish the waste tire recycling network model. The decision variable is whether the network nodes are set or not, the traffic flow between nodes. Constraints include meeting customer demand, balance of flow in and out of logistics nodes, etc. The model is solved by ε- constraint. Taking the actual data of the enterprise as an example, the operation results show that the operation cost, carbon emission and customer transportation distance can get an consistence within a certain range. Waste tire logistics enterprises can realize the simultaneous improvement of profit, environmental protection and customer service level.

Simulation of Rice Straw Oxygen-Steam Gasification in an Entrained-Flow Gasifier Using ASPEN PLUS

2011 ◽  
Vol 71-78 ◽  
pp. 2389-2395 ◽  
Author(s):  
Yuan Mou Wu ◽  
Jin Song Zhou ◽  
Zhong Yang Luo
Keyword(s):  
Rice Straw ◽  
Residence Time ◽  
Aspen Plus ◽  
Steam Gasification ◽  
Pyrolysis Process ◽  
Optimum Amount ◽  
Pyrolysis Products ◽  
Biomass Utilization ◽  
Gasification Process ◽  
Entrained Flow Gasifier

Biomass oxygen-steam gasification associated with synthesis technology known as indirect biomass liquefaction is regarded as one of the most promising technologies of biomass utilization. In this paper, a comprehensive gasification model was developed for the simulation of rice straw oxygen-steam gasification using ASPEN PLUS. The gasification process was divided into two parts: pyrolysis and gasification. The RYield module was used to simulate the pyrolysis process with an external FORTURN program to calculate the pyrolysis products while the gasification process was calculated by the RCSTR module. With the help of the model, the gasification of rice straw was simulated under different residence time, different temperature and different amount of steam. The results showed that the proper residence time and temperature is 1.5s and 1300°C, respectively. The optimum amount of steam is steam/biomass=0.12 while the addition of oxygen is oxygen/biomass=0.2.

scholarly journals Effects of pyrolysis parameters on the distribution of pyrolysis products of Miscanthus

2021 ◽  
Vol 46 ◽  
pp. 146867832110109
Author(s):  
Zhangmao Hu ◽  
Tong Zhou ◽  
Hong Tian ◽  
Leihua Feng ◽  
Can Yao ◽  
...  
Keyword(s):  
Heating Rate ◽  
Residence Time ◽  
Aromatic Compounds ◽  
Heterocyclic Compounds ◽  
Value Added ◽  
Building Blocks ◽  
Area Ratio ◽  
Relative Peak Area ◽  
Pyrolysis Products ◽  
Peak Area Ratio

This work presents a comprehensive study on the effects of pyrolysis parameters (pyrolysis temperature, residence time, and heating rate) on the distribution of pyrolysis products of Miscanthus. Py-GC/MS (Pyrolysis-gas chromatography/mass) was conducted to identify building blocks of value-added chemical from Miscanthus. The results showed that the main pyrolysis products of Miscanthus were ketone, aldehyde, phenol, heterocycles, and aromatic compounds. The representative compounds of ketone and aldehyde compounds produced at different pyrolysis temperatures changed obviously, while the representative compounds of phenolic, heterocyclic, and aromatic compounds had no obvious change. Large-scale pyrolysis of Miscanthus had begun at 400°C, and the relative content of pyrolysis products from Miscanthus reached the maximum of 98.34% at 700°C. The relative peak area ratio of phenol and aromatic compounds reached the maximum and minimum at the residence time of 5 and 10 s, while the relative peak area ratio of ketone compounds showed the opposite trend. The relative peak area ratio of aldehyde compounds was higher under shorter or longer residence time. For heterocyclic compounds, the relative peak area ratio reached the maximum of 27.0% at residence time of 10 s. The faster or slower heating rate was beneficial to the production of aldehyde and phenol compounds. The relative peak area ratio of ketone compounds reached the maximum at 10,000°C/s, 70°C/s, and 10°C/s, and the relative peak area ratio tendency of heterocyclic compounds was similar to ketone. For aromatic compounds, the overall fluctuations were large, and the relative peak area ratio was the highest at the heating rate of 100°C/s.

Rotary Kiln Slow Pyrolysis for Syngas and Char Production From Biomass and Waste: Part 1 — Working Envelope of the Reactor

2006 ◽  
Author(s):  
Francesco Fantozzi ◽  
Simone Colantoni ◽  
Pietro Bartocci ◽  
Umberto Desideri
Keyword(s):  
Residence Time ◽  
Flow Rate ◽  
Rotary Kiln ◽  
Heat Rate ◽  
Screw Conveyor ◽  
Pyrolysis Products ◽  
Slow Pyrolysis ◽  
The University ◽  
Pyrolysis Of Biomass ◽  
Solid Motion

A micro scale electrically heated rotary kiln for slow pyrolysis of biomass and waste was designed and built at the University of Perugia. The reactor is connected to a scrubbing section, for tar removal, and to a monitored combustion chamber to evaluate the LHV of the syngas. The system allows the evaluation of gas, tar and char yields for different pyrolysis temperature and residence time. The feeding screw conveyor and the kiln are rigidly connected; therefore a modification of the flow rate implies a modification of the inside solid motion and of residence time. The paper provides the theoretical and experimental calculation of the relationships between Residence Time and Flow Rate used to determine the working envelope of the reactor as a function of the feedstock bulk density and moisture content, given the actual heat rate of the electric heaters. The methodology is extendable to any rotary kiln reactor with a rigidly connected feeding screw conveyor, given its geometric and energetic specifications. Part 2 of the paper will extend the energy balance introducing also the yields of pyrolysis products.

Experimental Research on Pyrolysis Process About Corn Stalk and Rice Husks

2008 ◽  
Author(s):  
Guihuan Yan ◽  
Li Sun ◽  
Min Xu ◽  
Rongfeng Sun ◽  
Fengzhong Sun ◽  
...  
Keyword(s):  
Residence Time ◽  
Reaction Temperature ◽  
Volume Content ◽  
Liquid Fuels ◽  
Main Process ◽  
Rice Husks ◽  
Light Hydrocarbons ◽  
Pyrolysis Products ◽  
Temperature Changes ◽  
Permanent Gases

Pyrolysis is one of the most promising conversion routes for biomass utilization, wherein biomass can be converted to solids, liquids and permanent gases, which are all used as a fuel. Researchers have proved that non-condensable gases can be translated into electric power by the gas turbine unites and liquid fuels can be used in vehicles after refined. In this paper, we mainly researched the distribution properties of pyrolysis products, as well as the characteristics of permanent gases under different reaction temperature and residence time. The experiments prove that the main process of prolysis is the transformation of biomass to liquid at low temperature. Along with the increase of reaction temperature, hydrocarbons further crack into small-molecule gases, so the whole reaction gradually changes into the production of permanent gases. The results show that the reaction temperature which is closely related with the compositions of permanent gases has a more important influence on the pyrolysis products than the residence time. With the increase in the reaction temperature, the volume content of H2 rises sharply, while CO and CO2 both decrease obviously in the volume content. Meanwhile the volume content of CH4 increases slightly, especially when the temperature is lower than 500°C. And the highest volume content of light hydrocarbons achieves at about 500°C. As the reaction temperature changes from 400°C to 500°C, the LHV of permanent gases increases from 12.5MJ/Nm3 to 16MJ/Nm3. When the temperature exceeds 500°C, the LHV of permanent gases changes gently in a range of 16∼17 MJ/Nm3.

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