Oct. 28, 2024
Nowadays, pyrolysis technology is more and more widely used in the waste plastic management instead of landfill or recovery through granulation. Everything has two sides, and let's see what is the general advantage and disadvantage of this plastic pyrolysis oil technology in the following article.
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Pyrolysis technology converting plastic to oil
1. High efficiency
Pyrolysis technology is suitable for almost all kinds of waste plastic except PVC and PET, no matter if it is clean or unwashed and unsorted. For a batch waste plastic pyrolysis plant, there is even no need to do the shredding work. All the processes from plastic to fuel oil are carried out inside the waste pyrolysis reactor together with its accessory system, very convenient and man-power saving.
The process of plastic to oil conversion
2. Resource Recover
Pyrolysis plant allows for the recovery of valuable resources from plastic waste, such as fuel oil, carbon black, and combustible gas. This helps in reducing the dependence on fossil fuels and conserving natural resources.
(1)The obtained plastic oil is a good heating fuel for heavy industries, such as boiler heating factories, heavy oil power plants, steel factories, cement factories, glass factories, etc. And it can also be refined into diesel fuel for further uses.
Fuel oil extracted from waste plastic
(2)The carbon black can be briquetted by heating or refining for further uses. You can also sell it directly.
(3)Syn-gas can be directly used for heating waste plastic pyrolysis plant, saving machine operation cost.
3. High profit
(1)Economic benefits
Waste plastic such as PE(polyethylene), PP(polypropylene), PS(polystyrene) and ABS, etc. has higher oil yield above 50%, which means from the above 10ton waste plastic, you can extract at least 10tonx50%=5ton pyrolysis fuel oil. And the waste plastic is cheap and easy to collect. Some governments even publish policies and give subsidies for developing waste plastic recycling projects. It is a process to convert waste into new energy, so this project is absolutely profitable.
Plastic to fuel oil pyrolysis plant profit analysis
(2)Environmental benefits
Converting plastic waste into oil via pyrolysis plant can help in reducing greenhouse gas emissions and environmental pollution associated with plastic waste. It provides an environmentally friendly method of waste management.
1. High Initial Investment
Setting up a waste plastic to fuel oil pyrolysis plant requires a substantial initial investment. This includes the cost of acquiring land, machinery, obtaining licenses, and complying with safety and environmental regulations. It will take time, effort, and capital.
Pyrolysis plant setting up cost
2. Technical Complexity
Plastic to oil pyrolysis technology requires skilled personnel to operate and maintain the equipment. Technical expertise and intelligent monitoring are necessary to ensure efficient operation and optimum product quality.
From a comprehensive comparison, the advantages of using pyrolysis technology to convert plastic to oil outweigh the disadvantages. Plastic to oil pyrolysis technology is very good, but you need to be careful to choose the right pyrolysis plant supplier. High-quality suppliers can help your plastic pyrolysis project achieve twice the result with half the effort.
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DOING waste plastic pyrolysis plant project cases
DOING environmentally friendly pyrolysis plants are recognized by lots of customers from home and broad, welcome to contact us for more details. And Henan Doing Company can offer all-procedures of technical support and pyrolysis plant machine selection&installation services, worker training services etc. to help you develop the plastic to oil pyrolysis plant project smoothly, maximizing the profits.
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Article updated on 18/02/20 by Susha Cheriyadath
Pyrolysis is a process of chemically decomposing organic materials at elevated temperatures in the absence of oxygen. The process typically occurs at temperatures above 430 °C (800 °F) and under pressure. It simultaneously involves the change of physical phase and chemical composition and is an irreversible process. The word pyrolysis is coined from the Greek words "pyro" which means fire and "lysis" which means separating.
Pyrolysis is commonly used to convert organic materials into a solid residue containing ash and carbon, small quantities of liquid and gases. Extreme pyrolysis, on the other hand, yields carbon as the residue and the process is called carbonization. Unlike other high-temperature processes like hydrolysis and combustion, pyrolysis does not involve reaction with water, oxygen or other reagents. However, as it is practically not possible to achieve an oxygen- free environment, a small amount of oxidation always occurs in any pyrolysis system.
There are three types of pyrolytic reactions differentiated by the processing time and temperature of the biomass.
Slow pyrolysis is characterized by lengthy solids and gas residence times, low temperatures and slow biomass heating rates. In this mode, the heating temperatures ranges from 0.1 to 2 °C (32.18 to 35.6 °F) per second and the prevailing temperatures are nearly 500°C (932°F). The residence time of gas may be over five seconds and that of biomass may range from minutes to days.
During slow pyrolysis, tar and char are released as main products as the biomass is slowly devolatilized. Repolymerization/recombination reactions occur after the primary reactions take place.
Flash pyrolysis occurs at rapid heating rates and moderate temperatures between 400 and 600 °C (752 and °F). However, the vapor residence time of this process is less than 2s. Flash pyrolysis produces fewer amounts of gas and tar when compared to slow pyrolysis.
This process is primarily used to produce bio-oil and gas. During the process, biomass is rapidly heated to temperatures of 650 to °C ( to °F) depending on the desired amount of bio-oil or gas products. Char is accumulated in large quantities and has to be removed frequently.
Fast pyrolysis has been shown to benefit from the use of microwave heating. Biomass typically absorbs microwave radiation very well, making heating of the material highly efficient - just like microwave heating of food, it can reduce the time taken to initiate the pyrolysis reactions, and also greatly reduces the energy required for the process. Because microwave heating can initiate pyrolysis at much lower overall temperatures (sometimes as low as 200-300 °C), it has been found that the bio-oil produced contains higher concentrations of more thermally labile, higher-value chemicals, suggesting that microwave bio-oil could be used as a replacement to crude oil as a feedstock for some chemical processes.
Some of the reactors used in the pyrolysis process include the following:
Fluidized beds are generally simple to construct and design when compared to other reactor types. Bubbling fluidized bed pyrolyzers have large heat storage capacity, better temperature control, excellent heat transfer characteristics, and better gas-solids contact. In this pyrolyzer, the residence time of vapors and solids are controlled by the fluidizing gas flow rate. During the pyrolysis reaction, char acts as a catalyst in cracking vapors. Char is finally collected by entrainment processes.
Circulating fluidized bed pyrolyzers have similar characteristics as that of bubbling bed pyrolyzers excluding that the residence time of vapors and char is faster due to higher gas velocities. These pyrolyzers have better gas-solid contact, high processing capacity and potential to deal with cohesive solids that might otherwise be hard enough to fluidize in bubbling fluidized beds.
The ablative pyrolyzer, on the other hand, was designed so that the heat transferred from a hot reactor wall softens the feedstock under pressure. Large feedstock particles can be pyrolyzed in this pyrolyzer as the reaction rates are not influenced by heat transfer via the biomass particle. These pyrolyzers ensure high relative motion between the reactor wall and the particle and high pressure of the particle on the hot reactor wall. It avoids the need of inert gas and hence its processing equipment is small and the reaction system is more intense.
The key benefits of pyrolysis include the following:
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s dependence on imported energy resources by generating energy from domestic resources.Some of the major applications of pyrolysis include the following:
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