Pursuant to the management method for the reuse of industrial waste, the government authority in charge of the relevant end-enterprise announced that some waste resources can be used as auxiliary fuels, such as waste rubber, pulp and paper sludge, textile sludge, waste wood, etc., considering the amount of domestic waste plastic bag film each year Increasingly, due to the low recovery value of such substances, the current decontamination pipelines are experiencing difficulties. In order to increase their reuse value and reduce the amount of them entering the incinerator for processing, in order to extend the service life of the incinerator and avoid occupying the processing volume Yes, it is urgent to plan related energy recovery test plans to evaluate the feasibility of future reuse as auxiliary fuels.
Waste plastic bags are mainly made of polyethylene (PE) and polypropylene (PP). However, some composite materials or biodegradable materials are often mixed in the waste plastic bags recycled by the public; however, due to the recycling price of waste plastic bags It is not high, and its weight is not heavy. If it is implemented by manpower or other screening or identification methods, it may not be cost-effective; therefore, most recycling companies are unwilling to perform classification again. Generally speaking, when the calorific value is above 2,000kcal/kg, it can be burned continuously under the right conditions, and it is considered suitable as fuel or auxiliary fuel. The low-level calorific value of the wet base of the crushed waste plastic bags without granulation has reached 5,290~5,420 kcal/kg, which is quite close to the calorific value of coal (about 5,000~6,500 kcal/kg); from the viewpoint of calorific value, it is Suitable as fuel or auxiliary fuel.
The sources of waste plastic bags in this project are cleaning teams or recycling execution units in Taoyuan City, Miaoli County, Taichung City, and Hsinchu County. The total amount of waste plastic bags collected and processed in this project is 267 metric tons. Changxiang Environmental Protection Co., Ltd. will be commissioned to crush and pelletize waste plastic bags. The large amount of waste plastic bags collected will be temporarily stored in the project entrusted by this project for transportation. Dingli Company of waste plastic bags, and the finished SRF pelletized are also shipped back to Dingli Company for temporary storage.
The trial burning site is planned to carry out trial burning operations at the No. 2 fluidized bed boiler of the Xinwu Plant of Yongfeng Yu Industrial Paper Co., Ltd., and the on-site trial firing of about 200 metric tons of solid recycled fuel (SRF) pelletized from waste plastic bags has been carried out. The period of SRF granulation operation is about one and a half months (9/1~10/15). The SRF produced in this project is RDF-5 grade, which needs to be compressed into ingots/spheres or columns. The trial burning plan uses domestic waste plastic bags to make SRF. The maximum ratio of SRF to replace coal is 10%, and the period for trial burning is 10/19-10/23 for a total of five days. The burning trial cooperates with the implementation of environmental monitoring operations, including air pollutant emission testing and fly ash and bottom slag composition testing operations to confirm the emission of trial firing pollutants. The test results show that both tests for the air pollution and waste are in compliance with regulations and specifications, and the original procedures for reuse of both ash and slag are not affected.
The above test data is used to evaluate the feasibility of using SRF made of waste plastic bags as a replacement for coal. The evaluation results obtained are feasible. However, due to the low purchase price of waste plastic bags, SRF manufacturers have no profitability. The calorific value of SRF made of waste plastic bags is as high as 9,000 kcal/kg, which is very different from the calorific value of coal. Thus, it is difficult for small and medium-sized boiler plants to directly adopt the SRF (made of waste plastic bags) co-firing. Therefore, it is recommended that SRF manufacturers can mix and recycle other life or industrial waste to be used as the sources of SRF. Which not only can obtain relatively higher profits, and also the calorific value of SRF products is much reduced, which is helpful for subsequent SRF sales to the boiler plants.