Waste plastic treatment system and method based on heat carrier double-circulation heat supply

Abstract

The invention belongs to the field of solid waste disposal and utilization, and particularly discloses a waste plastic disposal system and method based on heat carrier double-circulation heat supply, and the waste plastic disposal system comprises a core reaction module, a product treatment module and a heat carrier circulation module. The core reaction module comprises an internal circulation reaction kettle as well as a screw rod and a heat carrier which are arranged in the internal circulation reaction kettle. The product treatment module is used for separating the pyrolysis product into a liquid state and a gas state. The heat carrier circulation module comprises a ball-residue separator, a heat carrier lifting device and a combustion chamber, the ball-residue separator is used for separating heat carriers from pyrolysis residues, the heat carrier lifting device conveys the separated heat carriers to the combustion chamber, the combustion chamber supplies heat to the heat carriers under the combustion action of gaseous products, and the heat carriers return to the inner circulating reaction kettle. Smoke in the combustion chamber is used for secondarily heating the outer wall cavity of the internal circulation reaction kettle. Through heat carrier internal and external double circulation assisted pyrolysis, efficient utilization of energy is achieved, uneven heating of the wall face is avoided, and meanwhile self-maintaining heat supply is achieved.

Description

technical field [0001] The invention belongs to the field of solid waste disposal and utilization, and more specifically relates to a waste plastic disposal system and method based on heat carrier double-cycle heating. Background technique [0002] Due to its excellent durability, corrosion resistance, easy plasticity, and stability, plastics are widely used in all walks of life, such as packaging, construction, automobiles, and electronic appliances. At the same time, due to the fact that plastics are difficult to degrade naturally, with the sharp increase in the output of plastic waste, many environmental problems have also surfaced, and the waste plastic recycling industry is facing severe challenges. Therefore, an energy-saving, environmentally friendly and efficient plastic treatment process is sought The plan is an inevitable trend. [0003] At this stage, waste plastics mainly enter landfill or incineration together with domestic waste. However, traditional landfill...

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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a waste plastics disposal system and method based on heat carrier double-cycle heating, the purpose of which is to solve the problem of insufficient fluidity and poor heat transfer during the pyrolysis process of molten plastics , easy to coke and stick to the wall, and at the same time realize the self-sustaining operation of the system and improve the energy utilization rate

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