In order to realize the clean utilization of hazardous wastes with heavy metals and organic substances, RE TECH has developed a unique low-temperature pyrolysis technology for organic hazardous wastes, which can be widely used in the resource treatment and harmless recycling of waste enamel wires, waste circuit boards, waste tires, and waste lithium batteries with the core equipment of the steel belt-type low-temperature pyrolysis furnace. The technology adopts anaerobic pyrolysis to carry out comprehensive recovery, avoiding the production of a large number of hazardous substances generated by direct incineration, while at the same time, all the organic matter will be converted into reusable products, realizing the recycling of hazardous wastes, and completely solving the problem of environmental pollution in the process of recovery of such resources. This technology has already achieved successful industrial application. Low-Temperature Pyrolysis Furnaces provide a sustainable and efficient solution for the treatment and recycling of hazardous and organic wastes. By converting waste into valuable by-products, they not only mitigate environmental pollution but also contribute to resource recovery and energy efficiency. This technology is especially relevant in modern waste management strategies aimed at reducing the environmental footprint and promoting circular economy principles.
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Low-Temperature Pyrolysis Technology for Hazardous Waste Treatment
Key Features:
Steel Belt-Type Low-Temperature Pyrolysis Furnace:
The core of this technology is a specially designed pyrolysis furnace that operates at low temperatures.
The steel belt mechanism ensures controlled and consistent processing of waste materials, enhancing the efficiency and effectiveness of the pyrolysis process.
Anaerobic Pyrolysis:
The process occurs in the absence of oxygen, preventing combustion and the release of harmful by-products typically associated with high-temperature incineration.
This method significantly reduces the emission of hazardous substances and environmental pollutants.
Comprehensive Recovery:
The technology enables the complete conversion of organic matter into reusable products.
Heavy metals are safely separated and can be reclaimed or disposed of in an environmentally friendly manner.
Waste-to-Resource Conversion:
Organic components of the waste are transformed into valuable resources such as synthetic gases, oils, and char, which can be repurposed in various industries.
This conversion supports a circular economy by reducing waste and promoting the reuse of materials.
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Applications:
Waste Enamel Wires: Efficiently recovers metals and organic insulation materials without the release of toxic fumes.
Waste Circuit Boards: Extracts valuable metals and other components, minimizing electronic waste.
Waste Tires: Produces reusable by-products such as carbon black and pyrolysis oil, reducing the environmental impact of tire disposal.
Waste Lithium Batteries: Safely processes and recovers valuable metals like lithium and cobalt, addressing the growing challenge of battery recycling
Introduction
Pyrolysis furnaces play a crucial role in various industries, ensuring the efficient production of ethylene and propylene. In this blog, we will discuss the mechanics of these furnaces, exploring their temperature requirements, cracking process, and the significance of the convection section. By optimizing the operation of pyrolysis, industries can enhance productivity while minimizing issues such as tube coking and lost production.
Temperature Control and the Gas Pyrolysis Process
To achieve the correct cracking of hydrocarbons, pyrolysis furnaces maintain a temperature of approximately -F (800-870°C). A narrow band of temperature range is vital for successful cracking. The reactions involved are endothermic, demanding a substantial amount of energy. However, due to the exceptionally fast cracking process, the light feed must be exposed to this intense heat for only milliseconds, allowing conversion to ethylene and propylene without promoting coke formation.
The Role of the Convection Section
The convection section serves as the vital pre-heat mechanism in pyrolysis, ensuring the correct temperature range is achieved. Deviating from this range can lead to inefficiency and limited conversion if the temperature is too cold or excessive coke formation if it becomes too hot. Maintaining an optimal flow rate is equally important to prevent overheating the product and generating coke.
Consequences of Fouled Convection Sections
When fouling occurs in the convection section, heat transfer becomes limited, resulting in an inefficient pre-heat process. To compensate, additional firing and fuel consumption are required to reach the desired temperature. This has a knock-on effect and overheats the radiant section, leading to potential complications. Ethylene furnaces are typically designed with a turndown range, normally down to 80% of design throughput rate, allowing them to operate smoothly. However, when the convection section is fouled, it may be necessary to reduce the flow rate below the turndown range, which can cause tube coking and reduced production.
Conclusion
Optimizing the performance of pyrolysis heaters is critical for industries aiming to achieve maximum efficiency in ethylene and propylene production. By maintaining the correct temperature range, monitoring flow rates, and mitigating fouling issues in the convection section, facilities can ensure smooth operations, enhance safety, and minimize downtime, ultimately elevating their overall production output.
Here is a case study you may be interested in:
TubeTech™ Reinstates Heat Transfer Efficiency of a Pyrolysis Furnace
About:
Over the course of six years in operation, furnace stack temperatures rose from 190 °C to 230 °C, equaling 2.0% losses in fuel efficiency. The furnace had no access points for cleaning. Find out how convection section cleaning restored efficiency.
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