A waste tire crushing and desulfurization integrated device and application method based on supercritical carbon dioxide jet

Abstract

The invention discloses a waste tire crushing and desulfurization integrated device and application method based on a supercritical carbon dioxide jet. First, the gaseous carbon dioxide is cooled to a liquid state and temporarily stored in the storage tank. The high-pressure plunger pump extracts the liquid carbon dioxide and pressurizes it and stores it in the buffer tank. After being heated by an oil bath, the liquid carbon dioxide is converted into a supercritical state, and the tire crushing tank is filled through the side nozzle. Supercritical carbon dioxide maintains a supercritical confining pressure environment, forms a supercritical carbon dioxide jet through the central nozzle, and completes waste tire recycling under a certain pressure. While completing the primary crushing of rubber, the high heat and mass transfer characteristics of supercritical carbon dioxide can reduce the desulfurization temperature of rubber, shorten the desulfurization time, simultaneously realize the high-efficiency desulfurization of rubber powder, and obtain high-activity fine rubber powder; after crushing, tire steel wire It can be completely recovered, and the gaseous carbon dioxide can be recycled. It has the technical advantages of simple process, scientific principle, safety and efficiency, energy saving and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of recycling waste tires and producing high-quality rubber powder, and specifically refers to an integrated device and method for crushing and desulfurizing waste tires based on supercritical carbon dioxide jets. Background technique [0002] my country ranks first in the world in the production of waste tires, and piles of waste tires have become the notorious "black pollution". Where to go has become a worldwide problem. The production of rubber powder is the leading direction of resource recycling of waste tires, and is considered to be the first step in the recycling of waste tires. The normal temperature mechanical crushing method is currently the main recycling method for waste tires, but it faces severe technical bottlenecks. On the one hand, mechanical crushing at room temperature includes processes such as ring cutting, wire drawing, coarse crushing, fine crushing, magnetic separation, and fiber se...

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the shortcomings of the existing technology and solve the problems faced by the recycling field of waste tires, the quality of the rubber powder obtained by primary crushing of rubber needs to be improved, the disconnection between the rubber crushing method and the desulfurization method, and the insufficient tendency of the rubber desulfurization method to destroy the cross-linked sulfur bonds, etc. Problem, the present invention proposes a waste tire crushing and desulfurization integrated device and method based on supercritical carbon dioxide jet, which mainly uses supercritical carbon dioxide fluid as the jet medium to fully pulverize the tire rubber, completely retain the tire steel wire, and in the process Give full play to the advantages of high-efficiency desulfurization assisted by supercritical carbon dioxide fluid, synchronously and directionally break the cross-linked sulfur bonds, and realize efficient desulfurization of rubber

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