Near-zero emission treatment process and complete equipment for waste tire thermal cracking waste gas pollution

Abstract

The invention discloses a near-zero emission treatment process and complete equipment for waste tire thermal cracking waste gas pollution. The treatment process comprises the following steps: 1) thermal cracking and product reuse, to be more specific, waste tires are thermally cracked, product carbon black and steel wires are recycled and reprocessed, and product pyrolysis oil and pyrolysis gas are combusted for heating; 2) exhaust gas secondary combustion, to be more specific, carbon black particles mixed in waste gas are completely burnt, and high temperature formation of dioxins can be inhibited; 3) rapid cooling of the waste gas, to be more specific, low temperature re-synthesis of the dioxins can be inhibited; 4) desulfurization and denitrification of the waste gas, to be more specific, nitrogen oxides and sulfur dioxide in the waste gas are removed; and 5) drying and dust removal, to be more specific, particulate matters in the waste gas are removed, and the waste gas is degradedinto non-toxic and harmless cleaning gas. The complete equipment is matched reasonably, and various products in the thermal cracking process of the waste tires are effectively utilized to achieve near zero emission of the waste gas pollution.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a treatment process and a complete set of equipment for treating waste tire pyrolysis waste gas pollution with near-zero emission. Background technique [0002] With the improvement of people's living standards and the rapid development of the logistics industry, the number of various types of motor vehicles in my country has increased year by year. The development of transportation drives economic development, but at the same time the consumption of automobile tires is also increasing. As solid waste, waste tires are stacked in the open air or directly burned to affect the environment, which is called "black pollution". Pyrolysis is one of the important ways to recycle waste tires, but it is easy to cause secondary pollution and cause devastating pollution to the environment. How to effectively reduce or even nearly zero discharge of toxic and harm...

AI Technical Summary

Problems solved by technology

[0005] First, the overall design is too single, and the products of pyrolysis of waste tires cannot be fully utilized, and the fuel cost is too high

[0006] Second, because the production temperature of dioxins is 300-700°C, and some carbon particles cannot be fully burned and the high-temperature flue gas cools down slowly during the pyrolysis process, these two parts are very easy to produce dioxins

In addition, toxic and harmful gases such as nitrogen oxides and sulfur dioxide are generated, which seriously pollute the atmospheric environment and endanger human health.

[0007] At present, some pyrolysis furnaces on the market use low-temperature catalytic method to pyrolyze waste tires. Although it saves combustion costs compared with traditional methods, its operating temperature is basically in the temperature range of 300-500 °C, and the waste gas stays in this temperature range for a long time. Too long, easy to produce dioxin-like harmful substances

The follow-up waste gas treatment process is activated carbon adsorption, and dioxins are transformed from gas phase to solid phase, and there is no real treatment and purification

However, there are still problems in the treatment of nitrogen oxides, sulfur dioxide and some particulate matter

[0008] To sum up, the existing waste tire pyrolysis technology is difficult to achieve effective control or even near-zero emission of pyrolysis waste gas pollution. Research and invention of waste gas treatment technology that conforms to the concept of environmental protection is conducive to promoting the development of waste tire pyrolysis technology

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